Rancher + Harvester + Flatcar

I have a 3 host Harvester cluster, and I want to run rke2 on flatcar. In the Rancher docs it says to add a blurb in the cluster.yml file. But in Rancher when i click on edit in yaml, that file looks nothing like the example in the Rancher docs. Not even sure I am hitting the right file.

Is anyone running Flatcar on Rancher 2 with Harvester? If so, how to properly add the CNI config to cluster.yml?