how to have a plasmoid that shows the current activity name like the kashew in the top right of screen?

I'm starting to use activity, but I would like to know at a glance in 
wich activity I am
how to have a plasmoid that shows the current activity name like the 
kashew in the top right of screen?
but in bigger and more readable characters and colors..

manythanks, ciao :-) pier
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