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Sorry, it is not currently possible

Thank you for the answer, is that a planned in the future? Or is it possible to do this using Podman with Rancher Desktop

It is a wish list item, but not currently planned. If you are using macOS or Linux you could run plain Lima to start a VM with rootless docker with

limactl start <template://docker>

, but it does not have any kind of UI and you would have to manage the VM yourself.