Linking batch file projectPath to a Azure Devops repository .prj file

Good afternoon, I recently have started working with a new company to help build automated testing suites for their newer projects.
We are at the point now where we want to try and integrate our current batch files for executing test suites into our Devops repositories.
I am however new to devops integration and I am unsure how to set the projectPath variable so that it is pointing to the correct .prj file in the repository.

Basically my question is: how do I link the projectPath to the .prj file in the Devops / Git repository instead of having it pointing to a file location on my desktop.

Thank-you in advance,