I've tried to get a set of vector tiles (`.pbf.json` generated with tippecanoe) working as a background, but the docs don't specify if vector tiles are accepted

I've tried to get a set of vector tiles (`.pbf.json` generated with tippecanoe) working as a background, but the docs don't specify if vector tiles are accepted, and all the examples are raster tiles. Can you use vector tiles as a custom background? If so, how, and are there limits on format support?