How to Create Custom tool for Viewport(pic included)

Development Programming & Scripting UI
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Hi There,

I am new to UE4, Could some kindly direct me or guide me =) on how to make custom tool on my Viewport and** NOT from blueprint (**because widget requires me to play the game first and it’s heavy).

I want to add customize button,for example, Bloom Toggle button on my Viewport,so everytime I launch my unreal the custom buttons are there.

I know I can click show and post processing and turn it off, but that’s like 3 steps.
I included the picture below.

Thanks so much Masters!

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Creating an editor module

C++ Extending the Editor