I don't believe so but you have a couple of options. You can cast from your phone or side load the regular Android app. For sideloading I needed to also run a portrait/landscape app to rotate it.

You can sideload the Fire TV version of the app. See this thread at XDA.

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https://forum.xda-developers.com/shield-tv/help/ultimate-directv-fire-tv-apk-repository-t3854154

i used the nbc sports kodi addon. works pretty well.