This was my attempt to use the javascript filtering to assign to the previous previous submitter, so that when a task is rejected, it doesn't go back to the same person that choose reject.

It just assigns it back to the entire team though.

Is there any way to do this? Can't seem to find a way to have approvals and rejections on forms that are assigned to teams, since we don't know who submitted the task.

We use initiator all the time to assign to the person who initiated the process, it is a similar concept, but instead of initiator, we need the submitter of the person who submitted a task for approval.