Missing example in the docs/Scripting-Language to retrieve .json from url: how to use gjp("host" "path")?

PROBLEM DESCRIPTION

A clear and concise description of what the problem is. I want to use my tasmota smart plug to turn ON/OFF my DIY air filter when my Luftdaten sensor is above a certain threshold). The smart plug should connect to my json local url (like http://192.168.1.39:888/data.json) and based on the data in this json the plug should switch on and off. Following the docs/Scripting-Language, in user_config_override.h, I enabled reading HTTPS JSON WEB Pages with #define SCRIPT_GET_HTTPS_JP but don't find any ressource on how I can use gjp("host" "path") to get the data on the json. The only mention is :

gjp("host" "path") = trigger HTTPS JSON page read as used by Tesla Powerwall (if defined SCRIPT_GET_HTTPS_JP)

A lot of others features are well documented but not this one.

Among other, the missing information are:

How to define the variable to retrieve the data from gjp()?
How to extract the value from the json

An example of the full script from send request/retrieve the request is really needed on the documentation

(After these step I will have to send the command "http://192.168.1.54/cm?cmnd=Power%20On" or "http://192.168.1.54/cm?cmnd=Power%20Off" based on the extracted json value and then recheck the json every 140secs ?

REQUESTED INFORMATION

Make sure your have performed every step and checked the applicable boxes before submitting your issue. Thank you!

[ x] Read the Contributing Guide and Policy and the Code of Conduct
[x ] Searched the problem in issues
[x ] Searched the problem in discussions
[ x] Searched the problem in the docs
[x ] Searched the problem in the chat
[ x] Device used (e.g., Sonoff Basic): Athom smartplug (esp8266)
[ x] Tasmota binary firmware version number used: 9.5.0
- [x ] Pre-compiled
- [ ] Self-compiled
[x ] Flashing tools used: esptool

Not needed

[ ] Provide the output of command: Backlog Template; Module; GPIO 255:
```
Configuration output here:
```

- [ ] If using rules, provide the output of this command: `Backlog Rule1; Rule2; Rule3`:
```lua
  Rules output here:

[ ] Provide the output of this command: Status 0:
```
STATUS 0 output here:
```

- [ ] Set `weblog` to 4 and then, when you experience your issue, provide the output of the Console log:
```lua
  Console output here:

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arendst / Tasmota