c# – Hide and show button background in unity

I am trying to make transparent (legacy) buttons in unity. I want to be able to see the button text, but not see the background button image (aka the ‘clickable’ area). I am not asking about hiding/showing the button and the text completely.

I have tried disabling the button, removing the Target Graphic image, setting the alpha values to 0, but none of these seems to have any effect.

Do I need to just remove the button object and write some sort of script that hangs off a text object to detect clicks?