Apps & Marketplace helm install - by CLI?

How can the helm install that “Apps & Marketplace” does be done by CLI? Rancher 2.5.5

(ideally using the “local” v1.18.12+rke2r2 or k3s binary helm/manifests dir capability, cluster is k3s v1.19.7+k3s1

The “Apps & Marketplace” in Cluster Explorer is just calling vanilla helm 3 to launch things and showing the state that generates (in secrets) as “Apps”. So you just use the normal helm 3 CLI, or anything else that indirectly does.

No helm was installed, so where is this functionality coming from?
It’s a generic rancherd 2.5.5 install