You could use a script in workflow with a.NET library like NPOI (free)

https://github.com/dotnetcore/NPOI

https://poi.apache.org/components/spreadsheet/quick-guide.html

If you want a prebuilt version:https://intranet.groupeaa.com/techniciens/inno/NPOI.zip

To install it, unzip the zip file on your workflow server to c:\NPOI

Open cmd.exe as administrator

cd c:\NPOI

gacutil.exe -i ICSharpCode.SharpZipLib.dll

gacutil.exe -i NPOI.dll

gacutil.exe -i NPOI.OOXML.dll

gacutil.exe -i NPOI.OpenXml4Net.dll

gacutil.exe -i NPOI.OpenXmlFormats.dll

Add a "SDK Script" activity to your workflow

Add the reference to NPOI and Laserfiche.DocumentServices (to import and export document)

Sample script to read an excel file(the document you are running the script on in laserfiche must be an excel file):

namespace WorkflowActivity.Scripting.SDKScript
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Data.SqlClient;
    using System.Text;
    using System.IO;
    using Laserfiche.RepositoryAccess;
    using Laserfiche.DocumentServices;
    using NPOI.XSSF.UserModel;
    using NPOI.SS.UserModel;

    /// <summary>
    /// Provides one or more methods that can be run when the workflow scripting activity is performed.
    /// </summary>
    public class Script1 : RAScriptClass104
    {
        /// <summary>
        /// This method is run when the activity is performed.
        /// </summary>
        protected override void Execute()
        {
            DocumentExporter DE = new DocumentExporter();
            DocumentInfo DI = (DocumentInfo)BoundEntryInfo;
            MemoryStream MS = new MemoryStream();
            DE.ExportElecDoc(DI,MS);
            XSSFWorkbook WB;
            try
            {
                MS.Seek(0, SeekOrigin.Begin);
                WB = new XSSFWorkbook(MS);
                WorkflowApi.TrackInformation(WB.Count.ToString());
                ISheet SH = WB.GetSheet("Sheet1");
                for (int row = 0; row <= SH.LastRowNum; row++)
                {
                    if (SH.GetRow(row) != null) //null is when the row only contains empty cells
                    {
                        WorkflowApi.TrackInformation(string.Format("Row {0} = {1}", row, SH.GetRow(row).GetCell(0).StringCellValue));
                    }
                }
            }
            catch (Exception e)
            {
                throw(e);
            }

        }
    }
}

Sample to read and write to an excel document:

namespace WorkflowActivity.Scripting.SDKScript
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Data.SqlClient;
    using System.Text;
    using System.IO;
    using Laserfiche.RepositoryAccess;
    using Laserfiche.DocumentServices;
    using NPOI.XSSF.UserModel;
    using NPOI.SS.UserModel;

    /// <summary>
    /// Provides one or more methods that can be run when the workflow scripting activity is performed.
    /// </summary>
    public class Script1 : RAScriptClass104
    {
        /// <summary>
        /// This method is run when the activity is performed.
        /// </summary>
        protected override void Execute()
        {
            try
            {
                DocumentExporter DE = new DocumentExporter();
                DocumentInfo DI = (DocumentInfo)BoundEntryInfo;
                MemoryStream MS = new MemoryStream();
                MemoryStream MSOUT = new MemoryStream();
                DE.ExportElecDoc(DI,MS);
                MS.Seek(0, SeekOrigin.Begin);
                XSSFWorkbook WB;
                WB = new XSSFWorkbook(MS);
                WorkflowApi.TrackInformation(WB.Count.ToString());
                ISheet SH = WB.GetSheet("Sheet1");
                for (int row = 0; row <= SH.LastRowNum; row++)
                {
                    if (SH.GetRow(row) != null) //null is when the row only contains empty cells
                    {
                        //sample code
                        string mytoken = (string)WorkflowApi.GetTokenValueFromName("Mytoken"); //retreive token value from workflow
                        SH.GetRow(row).GetCell(0).SetCellValue(1.2);//numeric
                        WorkflowApi.TrackInformation(string.Format("Row {0} = {1}", row, SH.GetRow(row).GetCell(0).NumericCellValue.ToString()));
                        SH.GetRow(row).GetCell(1).SetCellValue("This is a string"); //text
                        WorkflowApi.TrackInformation(string.Format("Row {0} = {1}", row, SH.GetRow(row).GetCell(1).StringCellValue));
                        SH.GetRow(row).GetCell(2).SetCellValue(mytoken); //text from token
                        WorkflowApi.TrackInformation(string.Format("Row {0} = {1}", row, SH.GetRow(row).GetCell(2).StringCellValue));
                        SH.GetRow(row).GetCell(3).SetCellValue(true); //true or false
                        WorkflowApi.TrackInformation(string.Format("Row {0} = {1}", row, SH.GetRow(row).GetCell(3).BooleanCellValue.ToString()));
                    }
                }
               
                WB.Write(MSOUT);
                MSOUT.Seek(0, SeekOrigin.Begin);
                DocumentImporter Importer = new DocumentImporter();
                Importer.Document = DI;   
                string contentType = DI.MimeType.ToString();
                string extension = DI.Extension;
                DI.DeleteEdoc();
                
                Importer.ImportEdoc(contentType,MSOUT);
                DI.Extension = extension;
                DI.Save();
            }
            catch (Exception e)
            {
                throw(e);
            }

        }
    }
}