Premiere Pro Metadata & iXML/BEXT for Broadcast WAV files

Hi.

For feature film workflows, we depend greatly on the iXML and BEXT chunk in broadcast wave files.

As far as I can see, the XMP metadata "engine" (don't know of a better word) doesn't "see" the iXML and BEXT chunk in broadcast wave files.

Is there a particular workflow/workaround where the iXML and BEXT metadata show up in the "Metadata" tab in Premiere Pro.

Thanks!