As of this moment, those new artifacts are not supported by default in Galaxy Forge for custom maps. However, if you are willing to make a small mod (only 1 file), you can get them in there.
If the link is still up, you can just download that file and follow the intructions here.
If the link no longer works, I have a tutorial on how to add artifacts and bonuses here.
If you have any issues, feel free to ask about them in any of these threads.
