Firebase SDK with PostgreSQL in the back end (is there a need)

I've built a proof of concept where it's possible to take an application build with Firebase (Firestore specifically) and only by changing the "host" parameter in it's configuration, have it interact (read/write) with your own PostgreSQL instance.

It can be deployed as a single docker container on your own infrastructure (which can still be serverless with things like Fargate).

Would something like this be interesting/useful to you?

I am trying to see if there are potential users that have started with firebase but have hit limitation (technical or pricing) and need a way to migrate without rewriting the entire UI (or maybe they like the sdk and want to keep it even if the UI rewrite is not painful)