Tags with values

[alnmy]

Would it be possible to make more in-depth tags which allows for another value within itself?
This could be useful for people using auto-tagging scripts which use unreliable technologies such as Deepdanbooru, as you could differentiate a tag which was added manually or by the AI or if you wanted to add information about the location of a post without having hundreds of different tags for places throughout the world and instead having a single location tag and then adding a value to that. You would search these types of tags like location:Russia or tag:deepbooru_tagged.
I wasn't sure if putting this in the "Ideas" section was the right decision as this is mostly an issue I'm having with the way I manage my own personal szurubooru instance, so I am open to suggestions on how I could solve this issue with how szurubooru is currently.