It seems to make sense!

And https://wiki.openstreetmap.org/wiki/Any_tags_you_like is a thing.

If you want you can create thread at https://community.openstreetmap.org/ (in tagging section probably or in community for your region if it exists)

But you can just ignore it...

If you want you can also create a wiki page for this tag.

If you want to do either of that and want help - just reopen this note and comment or send PM to me.

I will close this note for now and add this value to rare not documented values that look reasonable.