API - Deals Timeline Endpoint

Afternoon Pipedrive Community!

I am trying to pull the number of deals that I have based on a custom field date and I am getting the “Deals forecast feature not enabled”.

Basically what I am trying to return is the number of active deals I have by quarter based on a custom field I have labeled “RFP Due Date”

Is there another way to do this? I do not want to pay for a professional plan as that would over quadruple our cost when we really only need it to pull this one report.

My main goal of the report is to make sure we do not have more opportunities than we can handle within each quarter (there are some other factors but deal count is really the main need).