Instrument and mallet pictograms can definitely be added. They’re glyphs in SMuFL fonts. I’ve created playing techniques with them to show mallets/sticks. If you want them as the staff name instead of text, I imagine that’s also possible, though I’ve never tried.
Here’s a handy reference:
https://www.w3.org/2019/03/smufl13/tables/tuned-mallet-percussion-pictograms.html