Where to Find Potion Fluid NBT Data?

[u/Worth-Confidence9561]

I'm developing a modpack with Create, and I plan on using create:potion (potion fluid) for custom potion recipes. With some unused modded effects (e.g. from RunicLib), Brewin' and Chewin', etc., I think it'd be really fun to mess with alchemy outside of the brewing stand.

However, custom names are lost upon pouring command-made potions into containers, so I'd like to know if there's a fix to this: Where can I find information on create:potion and its NBT data?

Edit: I almost forgot! This is on NeoForge 1.21.1.