I just figured out how to make it show the translation automatically using an extension.
I am using Chrome and had the Custom Key Binding extension.
I realized I can reuse same keyboard key for different actions so I set key D for next page. Then I set key D to also click on the show translate button. I also set key D to play the audio.
So now I just need to press D and it goes to next page, play the audio and reveal the translation ! This will save my fingers.
Below is how the setup looks like in Custom Key Binding. I use Key A for previous page.
