Im running Zorin 17.1 and have already had issues getting some Gnome extensions running. I hope it's not the problem here because I couldn't fix the "Host Connector"-issue before but here's what extensions.gnome.org shows:
(Although the GNOME Shell Integration extension is running, the Native Host connector was not detected. See documentation for instructions on how to install the connector.)
No, this Extension is only until Gnome 42 and on Zorin You have Gnome 43. theoretically you could install Gnome 42 from the Ubuntu Repo's but then You could have Problems with other Extensions.
I don't know if it is the same that You want but maybe the Advanced Volume Control could be an Alternative.
I better don't change running system that immense for that small purpose
Advanced Volume Control
is changing the volume for the sound interfaces, I am trying to find an extension to change the volume for the application using a sound interface. like in the Zorin settings but from the sys tray.
Like it appears in Audio in the setting menu:
but more easy operable from the system tray, like here:
Hmm ... I know Quick Settings Tweaker but I don't know if it delivers the specific Adjustment what You want. It is more a Way to customize the Quick Settings. And there are some Audio Options, too. But I don't think that this will help You ...
Yes, is a nice Extension, isn't it? In origin, I used it because I saw that it was possible to switch the Notification Area in the Quick Settings and the Calendar then is only the Calendar. But it offers some other Functions, too.
I used to use that alot too, but having the option to volume adjust an individual program quickly and on the fly is a really nice to have. Rare that I use it, but definitely nice to have