Extracting a value from a Json to call another URL

[vincent@cream]

Hello,
I'm new to Zabbix, and trying to do the following :
- Create a HTTP agent item to retrieve a value from a Json (in Preprocessing JsonPath i'm guessing)
- Use this value in a dependent Item (URL parameter of previously found value) to check the final result (Json response from that second URL)

Am I doing it the right way ? i'm a bit struggling, thanks in advance for some help