Question: Screenlets in PureOS

Can anyone give me a hint how to get some screenlets running on my Librem 13 v3? I don’t have a big linux background. Tried some bits and pieces, but didn’t get anything working. Probably only wrong ressources for research? Might there be even something like that already within Gnome?

Would like to place some obvious system ressource usage thingies in desktop eg. as in partedmagic or so.

Thanks in advance