Automatic build of diff-files between Oracle Target Scheme and DDL out of git-Repo

Hello
I am quite new using Liquibase.
we are using Liquibase with a self-developed Tool to build the changelogfiles for our Schemas.
In the old version (3.5.3) it was said, that it was impossible to make a diff between the actual DB-Schema and our DDL Files. To do this our Tool creates a Target-Schema inside of the DB with all SQLs from our Repository and make the diff with the actual Schema.
We also run some pre- and post steps (create some objects, cut out some sqls with sed)

Is there a way in the actual Version to get the changelogfiles generated directly out of our git repositories, where we store the SQLs and Changes ?

We dont want to handle changelogfiles on hand, because its too much.