Restrict music widget to certain music app

How can we restrict music widget to a certain music app?

E.g I want it to only control music of google play music player. It should not change if I play music from another app.

There is a specific option in the settings "preferred music player" this should always go back to the player you selected. It cannot be done on a specifc widget but only at app level.

Thanks a lot, buddy!

That did it.