No. If you want only one package from contrib, you can add the repo, pin it below your others, then pin scrcpy from contrib above the others. That should do what you want.
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Thank you all. That's what I thought - no way to make the query the way I was thinking of.
I realize that, if i'd like to have a program search for repos not configured in sources.list, then I would have to specify the repo as well (the https:// link, I mean).
The website half-fixes the problem, since it tells me the release the package might be in. But still doesn't tell me whether it is in main, contrib or non-free (section?).
Don't worry about me creating a frankendebian by mixing releases - I destroy my system in other more subtle ways like adding appimage applications as if there was no tomorrow.