how to use dialog flow cx generator response in a webhook regarding this use case , need help

[heshafinds]

hey i am working on a chatbot on dialogflow cx and one of it's flows are a healthcare finder , earlier in the bot layout i collect some parameters like user name age city and set the condition for transition to healthcare flow as $page.params.status = "final ", now after landing on healthcare page , i want the user to describe a set of symptoms (to roughly estimate ) what kind of doctor they will need and then i want to employ a generator to then interpret and give a list of possible types of doctor the person could require as an output , which then combined with previously collected parameters like city state gender etc i want to feed in a webhook that contacts google places api to give me a list result , now how do i configure the input , output and session parameters for the same , please help me im feeling stuck @alessiasacchi
@xavidop

[heshafinds]

@xavidop

@alessiasacchi  please reply

[AgrPiyush]

I'm looking for same solution, not able to send generator response either in text format or json format and cloud run function logs as POST Error code 400 which means request is not coming in correct format, 

this is custom request under flexible webhook i have defined:

{
"generative_response": "$request.generative.template_extraction"
}

can someone help here?