Referring a sql file that is out side the application's war

I am new to Liquibase. I am currently trying to integrate Liquibase in our enterprise application (Java, Spring). I have configured liquibase through Spring bean.  Now my question is, I want to include sql files in changeset, but the sql files cannot be present in our application’s code base. So is there a way to include the sql files in changest, which are outside the application codebase?

Or is there a way through which I can pass the sql file path dynamically from an environment variable?

Thanks in advance