How to integrate custom image tracking with AR Foundation?

Hi there!
Here's the deal: In my use case, I have to track an animated image target, which is sadly not supported by AR Foundation as far as I see. With my custom tracking solution though, I am able to locate the four corners of the image target in the 2D camera image. I also know the physical size of the marker.
Given this information, is there a way (ideally platform independent) to calculate the location and orientation of the marker in 3D, so that I can place virtual content on it?
Thank you!

 

Hi!
That's pretty much the problem I'm facing now - have you ever found a way to do it?