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I'll gladly share the code, it's basically an Ansible play which fetches an API-Token and the cluster's ID and issues an API request to

/v1/catalog.cattle.io.clusterrepos/rancher-charts?action=istall

with a body containing a

charts: {...}

map holding all the values to be configured. As mentioned above, this approach works like a charm for the cluster running Rancher itself, but not for a cluster managed by Rancher.