SUMMARY Currently, the plasmoid hover text is (translated from german) "Show notifications from your devices with kdeconnect." Much more useful and consistent with the networkmanager and bluedevil plasmoid would be to show the connected device(s) in the hover text.
That is tricky, due to the comment on the plasmoid icon being written in the metadata.desktop file. This makes the text being dynamic tricky.
In the plasma-nm applet, the hover text shows what device is connected, so there must be a way to show it dynamically :)
Yes, infact, I found a possibility to override this(I knew some plasmoids could do that, but I had to spend a whole day of research to finally find the function😅) , I am currently still working on reading things like battery information from within KDE-Connect.