Connect Mutliple Database - RDS

How to connect multiple Databases using a single RDS endpoint?

I’m using liquibase docker to connect the single DB. Below is the docker command that I used to run the liquibase.
docker run --rm -v :/liquibase/changelog -v <dep_path>:/liquibase/lib liquibase/liquibase --url=“jdbc:mysql://” --changeLogFile=changelog.xml --username=user --password=password status

My requirement is I need to connect multiple DB with a single RDS endpoint.