Is it possible to modify commands commans on the music widget (the big one, not the one in the bar)?

[NextStep-IM]

Do the buttons use playerctl for next, previous and stop? Now that multiple player windows are available, I want to modify commands on each player window of the widget. But I can't make sense of it. The music widget in the bar is using playerctl but I can't find anything for the big widget.

What I wanted to do:

Modify the commands on each player window like this:
playerctl --player=player_1 play/pause
playerctl --player=player_2 play/pause

[end-4]

stuff in those music controls use AGS' Mpris service
which should work cleanly in theory but it doesn't sometimes... idk