You should be able to create a miscellaneous drop-down menu with those specific things listed. I have dropped down menus for sensors and a number of other things, but I have an icon for my online availability. That also shows a number of other things like some sensor information and memory information and up time.I've just got it showing apps using significant energy, but I'd assume Bluetooth devices I've connected will also show their battery status there.
I'd love to just combine it with the Sensors menu to be honest, but not all sections can be combined.
My point is, it's supposed to show a lightning icon in lieu of the battery/charging status, but it doesn't seem to do so.