referential integrity between elements of an array and another table?

I was just reading this question on reddit (the text duplicated below). I
was wondering if there is an approach for handling array foreign key
references. I am interested in the answer since I started using array
fields as well. Thank you.

----- below is the message from the reddit poster:

https://www.reddit.com/r/PostgreSQL/comments/66a74t/question_referential_integrity_between_elements/

First off, thanks for taking the time. I don't see any "weekly help
threads" or anything so I hope it's okay I made a post.

*The Problem*

I'm extending our CRM database in order to manage the ISO documentation of
the company for which I work. We need, as part of ISO, to keep track of
project development meetings and attendees.

Currently, I have a "meetings" table with an attendee list as an array of
integers, each element corresponding to the id field in the "person" table.

How do I enforce referential integrity between elements of this array and
the id field in "person"? All I could find was a proposed change for 9.2 or
9.3 that got shot down...

Please help. I don't want to do a join table.