Hi @Aman Devrath,
To get count of each status from API you can do simple logic from below image.

Consider Instead of Aggregate you are looping API data and as per conditions just increment counter by one per loop cycle.
At end you will get counter for each status.
OR
Apply List filter for each condition and get length on ListFiler, so you will get count for condition applied.

Hope this solution will help you to resolve your problem.
Regards,
Narendra Bhangale.