DietPi and Suptronics X4000 DAC

Hi, just purchased this DAC since it is inexpensive and has an ess9018K2M chip. It works great as either a RoonBridge or NAA with HQPlayer. However, in both setups, I am limited to PCM 192khz. Any idea why that may be given the ess9018K2M supports DSD and higher PCM resolutions? Would it be possible to add i2s support for this DAC on DietPi?

I found on diyaudio under the moode forum that users are able to get it working using the rpi-dac (i2s) driver and adding the following to to /boot/config.txt