Given the attached JSON, I want to be able to create a {#LIGHTID} for the top level IDs, and then {#LIGHTNAME} for *.name.

When I pass LLD the link to the JSON, with pre-processing set to JSON, and the parameters set to $, I would expect it to return all the JSON, but the error I get is

Preprocessing failed for: {"1":{"state":{"on":false,"bri":254,"hue":8597,"sat":121,"effect":"none","xy":[0.4452,0.4068],"ct...
1. Failed: cannot extract value from json by path "$": unsupported character in json path starting with: ""

I don't know if Zabbix can descend in to the arrays during discovery to give me *.name, but at the very least it should be able to take in the entire block of JSON so that I can get the IDs using 

$.*~

Why is "$" not accepted by pre-processing?