How to format report-to directives?

[Synchro]

I'm attempting to use Permissions-Policy reporting in Chrome (Canary, v143). It works, and reports are triggered, but they are always sent to "Default", which I have not defined. I'm finding the descriptions of how to set the report-to directive very cryptic – an example would go a very long way to clarifying this.

Member Values may have a Parameter named "report-to", whose value must be a String. Any other parameters will be ignored.

For each feature-name → (value, params) of dictionary:
If feature-name does not identify any recognized policy-controlled feature, then continue.
Let feature be the policy-controlled feature identified by feature-name.
If params["report-to"] exists, and is a string, then set reporting-config[feature] to params["report-to"].

I have a named endpoint called csp set via both Report-To and Reporting-Endpoints headers, and I've tried all these combinations, without success; the reports are always sent to "Default":

Permissions-Policy: geolocation=(); report-to=csp
Permissions-Policy: geolocation=(), report-to=csp
Permissions-Policy: geolocation=(); report-to="csp"
Permissions-Policy: geolocation=(), report-to="csp"
Permissions-Policy: geolocation=(report-to=csp)
Permissions-Policy: geolocation=(report-to="csp")
Permissions-Policy: geolocation=(,report-to=csp)
Permissions-Policy: geolocation=(,report-to="csp")
Permissions-Policy: geolocation=(;report-to=csp)
Permissions-Policy: geolocation=(;report-to="csp")

As it stands, I can't tell whether this is due to an incomplete/buggy implementation in Chrome, or because I've not stumbled across the correct format, but either way, I'm not finding that the spec makes it clear.

[Synchro]

Someone kindly pointed me at this reporting doc; that's much easier to understand than the spec doc. What I had not realised at all is that the report-to param needs to be set separately for every feature, and the reason I was not getting this to work is that my real header was more like this:

Permissions-Policy: geolocation=(), encrypted-media=();report-to=csp

So my initial syntax was sort-of correct, but because it's not applied globally, this would only trigger report sends for encrypted-media violations, not geolocation ones.

Now I've ended up with this, which appears to work, though it's quite verbose:

Permissions-Policy: midi=();report-to=csp, microphone=();report-to=csp, camera=();report-to=csp, magnetometer=();report-to=csp, gyroscope=();report-to=csp, accelerometer=();report-to=csp, fullscreen=(self);report-to=csp, payment=();report-to=csp, geolocation=();report-to=csp, usb=();report-to=csp, encrypted-media=();report-to=csp

From this I gather there is no global report-to option? Perhaps that could be implemented as a special-case feature, like report-to=(csp)?