Pacatus I strongly suspect anything you write would be ok, but maybe you could send a sample to Joshua and he could share with the other moderators.
I am trying to think ahead to what implications might arise. One distant glimmer of a concern I have is just for the size of the forum data. Surely poetry would be largely text, but in the distant future I can see people wanting to share other types of art that are more space intensive (music, artwork) and for that I would encourage placing the material somewhere else and just posting links here. There are reliable websites where things can be stored (like Archive.org) and then links posted here.
In general I think we want to help "our people" share their work in whatever there interest is, and for that we can collaborate on suggestions as to how to do that.
But my first thought is as above - send the proposed material to Joshua (he is the poetry expert among our moderators), and he can share with the others.