Support for fetchpriority?

Dear Brinkmann

Many thanks for this great plugin!

Performance Lab’s fetchpriority module relies on wp_lazy_loading_enabled, and so doesn’t seem to work with Lazy Loader (https://github.com/WordPress/performance/pull/528/files/a709c915969e2d3bc4c4fc27a085e25957c3d7f4). I wondered therefore if it would be possible by any chance for Lazy Loader to support adding a fetchpriority="high" attribute to img tags within the .skip-lazy class?