Describe your enhancement

You can drag drop items from JEI to exporters, importers, external storages, interfaces etc. But you can't drag drop water, lava or modded fluids to them when they are in fluid mode. You have to have the fluid ready in your inventory always if you are using any fluid regularly. But if you able to drag drop the fluid it would be a lot nicer than clogging your inventory with buckets or tanks.

You can! Which version are you on?

Minecraft 1.20.1 RS 1.12.4 i tried with minimal mods but it wasn't working with fluids.

I just created an instance with only JEI and RS without GregTech and other mods to see if has any effect but it still not working.
Minecraft 1.20.1
JEI version 15.3.0.4
Forge version 47.2.23
RS version 1.12.4
Latest log: link

This has been fixed for RS 2.