How to add a header image to the collapse title?

I like the function and look of a header with the image. Is there a way to replicate that using the collapse element?

As I can understand, you need to add text as well as an image to the collapse tool title, unfortunately, that's not possible to do since the collapse tool will only allow text. 

We could forward this as feature request if you want, please let us know. 

Thank you.