There might already be commands that edit or change plasma but as of now, there are none added to the wiki page yet. My Suggestion is too add PRPL commands like SetPlasma, Remove plasma, etc. If there are already commands like this, but not added to the wiki page yet, then this suggestion is useless and you can just delete this post.
Edit: The reason i want this is because i have some nice ideas with plasma, but it involves PRPL to set it down/remove it.