Recreated a mounting bracket to make your stroller more versatile. It is only the right version, but you can mirror it, and it will fit on the left side as well.
There is no addon to this yet, so you have to create it for yourself. I was thinking about making a cup holder, gopro mount, pacifyer-holder, icecream-holder or whatever the kids are eating nowadays. I think that printing it flat, and bending the finished part into desired position provides the most sturdy design, as well as the kid not breaking it.
This should probably not be used to support a baby car-seat or other stuff that might damage your child. Use some brain here.