Extending BazelTestRunner to Add Custom Metadata to JUnit XML

I've been working on extending the BazelTestRunner to add custom metadata (properties) to the JUnit XML generated by Stripe's Java tests, but I'm hitting a roadblock.

The most promising approach I've found involves using the TestPropertyExporter singleton instance, but I'm uncertain about how it's meant to be used. Additionally, when looking into the Bazel codebase, I noticed that the method testEmittedProperty() in TestSuiteModel.java seems related, but it isn't being called anywhere.

Any advice or alternative suggestions would be appreciated.