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When I first saw this I thought this would be a use case for being able to apply tags to answers (which I've brought up before on Meta, IIRC).  But version *ranges* are a little different, and I don't think you want to necessarily create tags for every version of something *just* so people can tag answers.  (At least we have hierarchical tags, so you *could*, but it feels like it would often be clutter.)

Code Golf has a similar problem: answers to challenges need to specify the language, and they have a format they expect for answers to accomplish that, and new users have to learn it.

What do you think of the idea of answer *labels*?  I'm thinking of a short textbox, with guidance text that would be configurable per community.  Here that text might be something like "applicable version or version range"; on Code Golf it might be "language".  Users could type anything; it's not tags.  So there could be typos.  The label text would be formatted in some way that stands out and would be either embedded in or attached to the answer in some way to be determined.

Would something like this address the issue?

Note: This is just me talking; I don't know what it would take to implement it and haven't asked the dev team about it yet.  I'm asking about a potential solution so I know whether to pursue it.