How to set up a Mongo Tracker Store in Rasa-X

Hello. I Have a rasa-x deployed on a docker container, with docker-compose and docker-compose-override. I want to set up a mongo tracker store. The endpoints.yml looks like this:

This is the folder where I build from

How can i change those variable names in order to have a Mongo Tracker Store instead of this default Tracker Store?

Help please

I tried to replace the tracker store to MONGO, but the docker services ask for postgre I dont want postgres