Yes keyboard tooltips only parse itemlink and there is no way to modify it, we should add an item into the db, that's not possible.
I'll look a bit deeply to tooltip control, last time I didn't succeeded to access to whole part of tooltip (same as you I guess, found the sellprice. it must be somewhere, but still don't know.
I need to recheck but think Keyboard use esoui\ingame\tooltip\tooltip.xml (and ItemTooltipBase). there is some function to play with here.
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