Hey Afnan,
I think you will struggle to get Forms to do this work for you, but that's fine because as you mentioned this is something that Workflow can handle.
What I would recommend is using the Invoke Workflow activity within the Forms Process Modeler, so that once this Form is submitted/approved, a Workflow will begin, grab the Forms content (specifically the Applicants Manager value. Then you can do a database lookup to return the Folder Name within the row containing the Applicants Manager value.
This lookup will either return a single value (for example it will return Accounts if the Applicants Manager is Masood) or it will return no value. Therefore setup a conditional decision where the first branch handles a no-value scenario. The remaining branches should be designed to send those notifications.
Those notifications can contain anything from the Form, but also the Repository, etc. as you would expect from Workflow. However, there is currently no method of retrieving a User Task URL and sending that out using Workflow. (ie. when you send a User Task via Forms we can send the URL to the Task itself, however Workflow will be unable to do the same thing).
Let me know if you would like more assistance on this issue.
Thanks,