How can i connect to the db of new nextcloud installation with pgAdmin?

I am on the way to migrate from truecharts nextcloud to truenas nextcloud.
I managed to install a working nextcloud in electric eel and moved all userdata to the new location.
Now i want to connect to the database to load up my dump from the truecharts nextcloud, but i don’t know how to connect to the databes with pgAdmin. I have the credentials from the nextcloud config.php but what is the hostname? with that in the config: postgres:5432 i have no success