I was able to easily install standalone node-red. It works fine, the only small issue is the HA iframe panel does not display anything, when I click I get a blank/white panel.
Issue is because there is no certificate on the node-red url and the browser was blocking it for security reason.
Iām still trying to find a way to access node-red from HA with certificate. Meanwhile I just access node-red from a different tab in my browser.