robots.txt block all except lighthouse

I have a staging site, that I want to be able to test via google lighthouse - but do not want google to index it.

When I use this:

User-agent: *
Disallow: /

Lighthouse and google are blocked.

I think the user-agent is "Chrome-Lighthouse" for lighthouse (source), but I'm not sure how to write the syntax for robot.txt.

Any suggestions?

Solution

Thank you dbc the link gave me the answer

useragent: *
disallow= /

useragent: Chrome-Lighthouse
allow= /

Based on the comment it should be:

User-agent: *
Disallow: /

User-agent: Chrome-Lighthouse
Allow: /