How can i select the 'Current view button' inside view-header view-buttons?

This button:

It has no id or unique class to target it, as far as i understand from DevTools.

What i want: in my custom plugin, i want to add the ‘current View Mode’ (Source, Preview, ReadOnly) after the icon.

Something like this:

My plugin already has Ctrl E to cycle between the 3 view modes and it displays a notification, but i want to add the name in that icon too, for clarity.

Keybinds:

The notifications:

Yes, I implemented this feature: Easily switch between source mode <-> live preview <-> preview - #15 by AlanG