This is the Zip-it mini drain snake that auger-elbow is referring to.
There are several other similar ones.
Just a flexible plastic stick, a few feet long, with little barbs that grab and retrieve hair from down in the drain trap.
Zip-It Bath and Sink Hair Snare
https://www.homedepot.com/p/100665735
You just poke the end down the tub drain, an inch or two forward, then pull back a little, then keep trying to poke a few inches deeper, pull back a little, repeat.
Try going down there from different angles or approaches.
Yes, I know this sounds suggestive, hehe.
Although the most likely approach that will get you all the way into the trap is to go into the drain at the point farthest from the wall with the tub valve, nearest to the end of the tub opposite the drain.
The Zip-it can also go pretty far down the overflow, just remove the plate for access, but put a wet rag over the drain so you don’t lose the screws down there.