How can I add submit button in branching question?

Currently in branching question in a Branching Scenario content makes options are choosen without a submit button.


What I want is radio buttons as options and later submit button should be clicked to go to next branch.  Like in the attachement


Content types: 
BV52's picture


For this to happen there needs to be changes/additions to the code. The good thing about H5P is that it is open sourced so you or anyone in the community can make the changes. If you want to take a crack at it these documentation are a good place to start.