Nope there isn't you'need to check the esoui source code for groups, find the invitation stuff and check how the code shows the jump to leader stuff, then try to find a "hook point" where you could auto decline it.
Should be maybe somewhere around here:
https://github.com/esoui/esoui/tree/...i/ingame/group
Or search for "jump" in the sources, like this:
https://github.com/esoui/esoui/searc...nscoped_q=jump
You'll find the function here
https://github.com/esoui/esoui/blob/...hared.lua#L108
JumpToGroupLeader
Then search where it is used and try to find the space where "your popup" occurs.
Maybr it's not at the lua side of code and you cannot intercept or hook nor find it...