How to use HOST.NAME in Preprocessing Step

[admin@hilton]

I have created a HTTP Item in a template. The response of the url has the form

{
   "AP-1020": {
      "name": "AP-1020",
      "2g-users": 3,
      "5g-users": 0,
      "online": "Ja"
   },
   "AP-1030": {
      "name": "AP-1030",
      "2g-users": 1,
      "5g-users": 5,
      "online": "Ja"
   },
   ...
}

Now I want to use the JSONPath Preprocessing Step with the following selection
`$.['{HOST.NAME}'].['2g-users']` which should expand to `$.['AP-1030'].['2g-users']` for the Host "AP-1030".
But all I get is "cannot extract value from json by path "$.['{HOST.NAME}'].['2g-users']": no data matches the specified path". So the {HOST.NAME} macro is not expanded. What am i doing wrong?

[josoko]

Maybe are just LLD Macros supported => https://www.zabbix.com/documentation..._functionality

A JavaScript preprocessing could perhaps help, to fulfill your requirements:
- https://www.zabbix.com/documentation...ing/javascript

similar to that:

yourvar = {HOST.NAME}.2g-users;
return yourvar;