Hi @daniel-pardo_5658 ,
Thanks for the suggestion; Universal Packages already support tags in the package manifest file: https://docs.inedo.com/docs/proget/feeds/universal/universal-packages#manifest
Otherwise, if you're referring to "tagging" a package already added to a feed - that's a hard pass :)
The reason is that a package is designed to be self-contained (i.e. all the metadata about the package is stored within the package) and cryptographically sealed (i.e. so you can't edit/mutate a package). Tags break these, as they apply semantic metadata outside of the package.
These have caused big issues in ecosystems that have tried them (like npm) - but long story short, there's a good reason they don't exist and there's most certainly a better way to accomplish what you're trying to :)
Cheers,
Steve