Is there a way to modify pg_hba.conf from within the declaration?

[ElrohirGT]

Hi! I've been trying to develop a serverless API using SAM and would like it to connect to the postgres that devenv services wakes up. Long story short, I need the postgres to accept connections from all IP's, but this can only be changed from within pg_hba.conf. How would I go about defining this inside the nix file?

Here's the error it gives when trying to connect to it: