Whenever I want to move all the things out of the pocket is too slow, I hope to add a machine can put the pocket into it, and then automatically want to specify the items extracted

This actually exists in a way... kind of, you can crouch + right click an inventory with the pocket storage, and it will push out whatever items it can into the inventory(leaving 1 in each slot behind), and if you crouch + left click, you will absorb all the items that it can from the inventory into the pocket storage.

So there is such a design, I see, thank you!

Ya, its something ive forgotten to really document anywhere.