Access to Input - Generate Typed Inputs from editor and it will auto-generate an event "Pressed", "Down" and "Released" for each input registered.

Usage:

Add Input Broadcaster Service to the scene.

Listen to event (OnStart or where required)
Sandbox.InputManager.GeneratedInput.Pressed.Jump += MyImplementation;

If listening to event the event listener MUST be disconnected (OnDestroy and where you need it)
Sandbox.InputManager.GeneratedInput.Pressed.Jump -= MyImplementation;

Then you can implement any behavior you want or set the variables you need, example:
private void MyImplementation() { DoJump(); IsJumping = true; }