Pierre Schiller writes:
The Pose library in Blender is an important feature to improve workflow and speed up the animation production process. This tutorial will quickly present what you need to get up and running with the Asset Browser and the Pose Library storing method so you can share your character’s poses, animations, and more.
NOTE: I did this on the Pose Library Experimental Branch for Blender 3. You can read all the information and check the video review BENEFITS here.