Where do I store a large amount of data, for reference?

Thanks for your thoughts everyone. We have a lot of roles already so I'm a bit loathe to add more, for a workaround, essentially.

I do like the json file in assets, but even if the risk is small, those files are public, so could technically be found? Considering I'm planning to store user data I'd rather avoid that.

Guess I'm down to using a custom metadata field linked to community or a user account.