Me too. I've subscribed but so far will be unable to watch it. I have Fire TV but Amazon and Disney are not friends. Don't want to buy a Roku. No good Android TV boxes except Shield but it's long in the tooth. Thinking maybe a Chromecast Ultra via my tablet. CORDCUTTING IS HARD!
Disney like a lot of other content providers are going to provide first for the platforms that are most prevalent first as that will bring them the biggest return/income. If you want Disney to release an app for LG then I am afraid you will need to start lobbying them to make one directly via their feedback system.