Rock Pi X dtoverlay?

I am trying to install a raspberry pi hat onto a Rock Pi X and get it installed and working. The hat only utilizes a SPI interface, so I think this should be possible. The installation procedures for installing the hat onto the raspberry pi was to apply a “dtoverlay” to the /boot/config.txt file which will modify the device tree to include the nodes/fragments and call out the correct drivers.

I can’t quite figure out how to accomplish something similar on the Rock Pi X. I have tried installing Ubuntu as well as Fedora. After googling, it looks like there’s ways utilize u-boot to apply dtoverlays, but I’m generally unsure if the Rock Pi X even has u-boot installed (the bios screen looks like the standard blue background desktop PC bios screen).

Any advice on the best way to install this hat?