How to view old versions of a BPMN2 file that is inside Business Central's git repository ?

Issue

• While going through Administration -> Repositories ... sections and drilling down to a BPMN2 process definition to view the process, the Business Central application shipped with BPMS 6.0.1 installation doesn't seem to offer a way to pull the old version of those process definition files. There is a feature in jBPM Web Designer though to Enable Local History button, but it is not clear how to use it? What if users did not enable it before hand, then is there no way to see the old version of the process definition files?