I probably wouldn't. It invites questions and feeds insights you aren't looking for and don't want.
You can call it sports betting, fantasy sports, or whatever euphemism you might think is appropriate... but please understand any adult will read it as gambling, because that's what it is.
You may not view this as an addiction (and there's nothing in your post that would invite that kind of reasoning); however, you feel weird about it because you know that it is a vice and it's pretty well-established that most addictions become apparent to everyone else before they become apparent to the addict. That's why we have this societal messaging that encourages us not to believe someone that says "it's only a dollar" or "I can stop whenever I want."
In your case, it could be true that you really do only bet a dollar; and that you could stop if you wanted... but is that something you want to put on a job application? I just don't see an upside to listing this, but I can imagine permutations of downsides.
But who knows, professionalism as we have known it has been radically redefined as of late, so... Maybe the moral depravity is actually positive in the upside-down simulation we're living in.
