Is your feature request related to a problem? Please describe.
I'm playing with the Enigmatic Legacy mod which, among other things, adds modded potions, such as recall, molten heart and haste. I would like, for example, to use the rod potion or molten heart in the fluid tank.

Describe the solution you'd like
Would there be any configuration or even if you could add one to add compatibility with potions from other mods?
Or even any tips on how I could make a datapack for this?

well, the problem with enigmatic legacy potions is that they don't use base Minecraft potion class, which causes the backpcak to not recognize it as potion

so sadly compat with enigmatic legacy wont be added until they change their potions to extend base potion class