How to add selected chunk ?

[MartyLake]

Hi, I can successfuly open :Gdiffsplit to add a chunk, and close. I can also launch :Git add --patch. I can also open :Git, navigate to the file, press = to display the changes, and press s on selected changes #2214 .

I was wondering:
Since I have a plugin that shows in the sidebar which parts of the file have modification, is it possible in any file to add the selected lines without intermediary steps?
Best,