How to detect the effect of the potion effect cloud?

Hi!

I'm working on a mod for elemental materials on 1.16.5, and one of the parts needs to be splashed on blocks with specified splash or lingering potions to infect blocks, but I don't know how to detect the type of potion used .
I've tried using NBT detection (detect "Potion") and the /data command (/data get entity @s), but I can't figure out how to output the /data command.
I'm using a "when entity spawned" trigger.

(I tried for a long time)

(Sorry for bad english^^)