Is the plot related to the first part? (Pathfinder: Wrath of the Righteous)

No. They are not connected in a plot.

The events in Pitax are briefly mentioned.

SimplyTheCat
only Easter eggs, mentions and cameos. just looking for a blind elf - the storyteller from the first part

the game takes place in chronological order after the events of Kingmaker

In fact, there are quite a few references and the game directly pokes with this, but I have not played the first part, so I can say with confidence that this can and should be played) Moreover, everything that is a reference or reference to the 1st part is explained and chewed ...

SpoilerYou can also meet the dwarf Jubilosta from the kingmaker (random meeting on the global map)

Another Azimarka priestess from the Stolen Lands will drive up.

yes, there are really a lot of references to part 1, although they are not connected in the plot. From myself, I can say that playing this part, I already had the feeling of déjà vu more than once