Is the return values from Gemini API too complex to return by webhook?

[hhoanganh]

Hi everyone, as a free user, I am trying to call Gemini API by using webhook, free account cannot use appscript.
I can call the API and get the response as the bot monitoring result below.
For the return value, as i tried with: text / response.text / parts.text / content.parts.text / candidates.content.parts.text, ... still get the same error "Key not found".
I want to ask is this because of the Limitation of return values mentioned here  ?