I don't see a way to tag the precuts either, but you can change the alias of each one to something more descriptive, which might make it easier to find the correct one later on:
You'd still be limited to seeing only the precuts from a single source clip, though, since I don't see any way of "merging" preclips from multiple source clips into a single library to see them all at the same time. Maybe that's why tagging isn't supported?
YouTube/optodata
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