Ther are quite a few Bluetooth LE tutorials listed at https://www.espruino.com/Tutorials
As for basics check this one
You don't need to advertise the service at all. You only need to implement it via setServices.
As I understand it the contents of advertisement packet and what services are provided after connection is not directly related.
Not sure but I guess nordic uart could be removed from advertisement but you could still connect to it if setServices has 'uart : true'
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