No currently, but I can add one. In fact, it might be best to use an image which can also respond to mouse presses, but you won’t get the animation unless you hard code it. I think you’re on the right track using an .svg
It could be the SVG that is the problem. JUCE only supports a minimal set of SVG features. If you do anything fancy it might not show. Try the buttonon.svg in the Misc examples folder and see if that works. The SVG example seems to work fine for me when I try it.