How do I add new artifacts?

I suggest the following: in the extended map editor, there is a table called ArtifactTableRef or something similar. When I modified artifacts to suit my needs, I saw prices, the type (Major), bonuses, effects, and so on. I also believe I saw the artifact identifier you're looking for. I might be wrong, but I created my own artifacts by simply changing Frieda, Tank, and the Griffin Heart each time.

Added 8 minutes later
There, you can also click on Add and connect all the links to your data.