You can easily grab an MRSS feed for any type of playlist in Brid.
For custom, user-created playlists, just click on your PLAYLISTS section inside the CMS and you should see an MRSS icon next to each of your created playlists. Click on it and grab the URL to an MRSS feed of that playlist.
For dynamic playlists, follow the same instructions only click on GET DYNAMIC on the main left-hand menu under PLAYLISTS.
These feeds can easily be used for custom implementations with Roku Direct Publisher and Amazon creator for FireTV.