Appropriate image for a button, with a tutorial instruction

Hey I'm wondering what the best way it to approach showing hints to the player that show a button control. It's easy to use a string and say "Press A to jump", but what about when you want to use a picture of an Xbox Controller's A button if on gamepad, or an image of the WASD keys together, or the left stick, etc. I could easily detect where the input is coming from, and choose from an array of images I want to use for the control, but I'm stuck on how to show it.

The best I can think of is having one UI Text object to say "Press", one Image to show the button, and another Text object to say "to do this", at a minimum.

Is that really the only way to do it? It seems like you'd really struggle to keep the image and text fields lining up properly at different resolutions. Can I use something in the string to signify putting an image in its place?

Thanks Kevin