how to make 2 sided Reversed 3d-widget?

Hi folks. I’m a primary coder knowing little about the material system. And I need to make a 3d widget in VR to inform the user some information about some button. For instance, a widget notes “Trigger” you notice from the front, while you notice it notes"Trigger" from the back. It shall not look like the pictures I upload. Some advice offered me to make a material to handle this issue. But I know little about this filed. Any suggestions or links are very grateful.

either make the widget use screen space,
or update the widget rotation according to the camera,
or create two 1 sided widgets and stick them facing opp. directions

use screen space or update rotation make it like a 2d one. Use two widgets work but there need too many widgets.