Request all things about a specified channel

I want to build an mobile app for a streamer that checks his title for a specific keyword. That`s why I want to avoid iterating over multiple streams. Just want to focus on one and look if the title contain the keyword and in turn notify the user.
Can I isolate just one streamer with a query or do I need to write code that first singles out the user from the whole “Poker” stack and than scrape his title for the keyword?
I wanted to single out the streamer because sometimes he chooses to pick a joke/game type but still plays poker. In that case the query wont show him in the “poker” category.