JSON for Parallelogram Shape

Hoping someone may be able to help me here, as I have found no documentation on this. We are rebuilding our company theme and have page navigators using the Parallelogram shape with a designated % slant. I have the page navigator working, but the shape and slant are causing me issues. I even exported the formatted visuals from Power BI into json and I get what I assumed would be the proper classes and values, but it is still throwing an error.

Exported from Power BI: