Hiya @Tomahawk704,
No there is not a special filter that shows Stadia stream specific as far I know.
But I think it is a great suggestion! Please share your feedback/suggestion with the Feedback option within the Stadia app or stadia.com. 
Hi,
There's no official way of finding Stadia specific streamers, however, you can search for "Stadia" and then filter to Live (link in the screenshot below):
You can also look for Stadia communities as there are quite a few of those that often use the hashtags #stadia or #stadia100 plus there's a couple of groups like SBCN and GSN that are Stadia/cloud focused and have a number of streams 
