Hi,
that’s exactly what I have described. The Powershell script is an addon to Icinga 2, the node setup CLI command is provided natively. Hence my suggestion to follow along with the official docs and the steps to achieve that. I cannot provide a 1:1 mapping since I never used the PS script myself. But I am sure you can map that yourself with the tables provided in the docs, and some trial and error.
Cheers,
Michael