Working left hand for Bedrock edition

Many Bedrock players, including myself, would like to see a working left hand in the game. Therefore, I would like to propose an option that would allow this feature to be implemented more adequately without disrupting the old controls. How it would work: when the player places an item or weapon in their left hand, a separate button appears for interacting with the left hand. 

It will also be possible to edit this button like the other controls.