Force InputField to stay Active

Hi,
I'd doing a mobile app with some text Area and i show some "Shortcut".

I created some button and when user click on the button i insert the shortcut into the textfield. However, because user click on a shortcut, the textfield is deactivated, i need to wait for the keyboard animation to be over and the Select the textfield again, which is not convenient at all.

Is there a way to keep the inputfield focused and allow user to click somewhere on the screen? I will create a large button in the top of the screen to manually deactivate it.

I'm using TextMeshPro InputField on Unity 2018.

Thanks.