Some of the GPOs wants json data as values. But sometimes it is not clear how some properties of the json element should be formatted or which data are expected. It would be great if the docs contains the json Schemas how Google it does. There they have some further information which can be helpful.
Example case for an exiting GPO:
There is a GPO called RelaunchWindow which expects a json data element as value. The GPO lets you configure the time until which the browser restart will be deferred. The json contains a value for hour and one for minute. But the docs doesn't contains a note if it is 24hour or 12hour format. This makes the things complicated. If you go to the Google Chrome GPO docs there you find a json schema which says that it is 24hour format and respects your defined time zone.
The team is continuously working on Policy Documentation improvements. I can pass this along to them and specifically for RelaunchWindow we can see if that can be fixed sooner.