(sorry for the late reply, was just reminded this subreddit was a thing!)
You should be able to - looks like youtube channels have RSS built in, so you can just use IFTT with an rss recipe:
https://ifttt.com/connect/feed/beeminder
I do the same sort of thing with my goal to upload new chapters of my vampire romance novel which you can see here:
I use Beeminder to track my progress studying Arabic. I set my required progress very low, and I earn breaks when I go on a study binge. Right now I'm trying to avoid binging, so I can make sustainable progress and go on making it just as well every day after the last. I have set two goals with somewhat arbitrary measures that are working really well for me:
(1) my Clozemaster score should go up by 280 points per day, on average. This number is enough to get to 300,000 points by the end of the year. (I hit 200,000 points on December 31! I've been doing this for a while, this is a fast pace, but not really for me at this point.) https://www.beeminder.com/yebyenw/arabiya
(2) my stack of cards "waiting for review" should be smaller than a given amount each day. If there are more than 1843 cards in my stack at the end of the day, I lose. https://www.beeminder.com/yebyenw/reviewstack
A third goal, abstract and not really monitored by Beeminder, is that I should stay close to the line. If I've done too much review, I need to play more new cards in order to beef up my stack again. A fun trick is to say "how low can I set the dial and keep my score that low, while still finding a way to challenge myself to make meaningful progress?"
Hi! I work for Beeminder, and it looks like Things app does work with Zapier, so you should be able to track it with Beeminder easily! Here's a link: https://zapier.com/apps/things/integrations/beeminder