I certainly recall how to do this with ScriptRunner on prem using issuefunction but I can't seem to figure out the equivalent function or options in cloud with or without scriptrunner.
I've searched to no avail, so here I am!
I'd like to write that typical query everyone is always trying to do for roadmaps it seems. I need all epics under multiple initiatives to pull all the various projects into a roadmap...
Maybe I'm just tired and missing how simple this is now