I use the Anycubic slicer which I think is still a fork from the Chitubox slicer - what I've done previously is save the supported model in the slicer as an stl, import that back into my 3D software, remove the model portion and leave the supports. Then I just include the supports with the model as I export the updated version to bring into the slicer. Except this time you don't need to add supports as they're already there.
Did that a couple times before deciding to just build my own supports while drafting the model which ensures I get everything exactly where I want it. And if I need to make changes I can move around my own supports, add to them, reduce, try different support methods, etc.
Cheers -Mike