Yep, I think that's totally kosher. I also like what you did with the `label_score` type things. People often misuse nip 32 to be a key/value store, but meta makes plenty of sense to include.
Discussion
Ah, thank you. It clears probably all my doubts with event structure migration. I think i can start slowly implement the new structure and deprecate the old structure in the following weeks.
Oh, I thought NIP-78 has been used for that. I think there was library to make key-value storage using NIP-78.