I would like to proxy (extend) the Embed component in order to modify the fallback values for the ./youtubeWidth and ./youtubeHeight embeddable properties. Even tried to copy the entirety of the core Embed component into my own app structure, but nothing I change in embed/embeddable/youtube/youtube.html works. The component falls back to the core code for youtube.html. Any pointers on how to proxy this component? Maybe I'm doing something wrong. Any help would be greatly appreciated.