Peter,
Hello!
This is something that we haven’t thought about or tried, so currently we don’t have a way to accomplish what you’re looking to do.
We will do some research and see if there is something that we can work out. My guess is that it will take us some time since we should apply it to not only the secondary footer, but other areas as well (secondary header, title bar, etc…).
Thank you for bringing this to our attention.
Thanks,
Josh