Can someone who knows calibre-web comment on the idea to add generic attributes/properties to content.

The data structure would be a table with admin created labels for a list of properties and a table that has property id, content id, and a value for the property for that content.

End users could add properties, like participants, or location, etc. for locally created video.

It would also be able to search content by property value.

I don't believe such functionality exists, but correct me if I am wrong.