og:image

Is there a way to manually assign the og:image property to attachment URLs? I was thinking I could edit the phrases in the templates to either pick one or the other, but I'm unfamiliar with xenForo phrases and it's been a millennia since I've dug around in templates to edit things. I've kind of...

Does anyone know of a plugin that will automatically take the first image in a thread or an attached image and assign it as the og:image? Thank you!