1 hr advanced training Salesforce Flow HTTP Post w/nested JSON

Hello!

I am an advanced Salesforce.com consultant/Flow user/developer and require a screen-sharing Zoom training on the advanced use of the relatively new Salesforce Flow HTTP Post callout function required for a specific purpose. I have been struggling to take in a single JSON text string with a 3 level nest of JSON objects in one HTTP Post callout response to Salesforce (I.e. a list of Grandparents, Parents and Children records. I have the objects and Flow built, the HTTP Post callout and the web service responding with the JSON response successfully but somehow in the setting up of the External Service action/response sample, I am struggling to take the data in and map it so that I can create the records in Salesforce. I presume that we can create the records either with a series of progressive loops in the Flow, (but ideally we would map and use the Transform element. Is this possible and if so, would we be able to do a paid consulting hour (I am based in the UK) on my Zoom account to show me how to do it? I believe that the solution lies in some error in the Apex defined variables used in the creation of the external service.

Please only reply if:

- you fully understand the requirements and how to solve this issue (I am confident in building Flows and using HTTP callouts. I am not looking for general training on this - it is the multi-nested response and Apex record variable callout response specific help needed. If you don't know the answer, the hour session will not be enough for a trial and error approach. I have done this already and gone round in circles :-)
- You can solve the issue in Flow only. I am not looking for a suggestion of an alternative Apex only solution
- We can hold the Zoom screen share session in English

The solution to this I think should be able to be delivered in 20 minutes, so if we can do that, I am happy to end the session right there and complete the project and payment. I will have prepared the org, data and Flow and will these ready for us to jump straight in, so having described the requirement above, will be expecting us to jump straight into the solution (there is only 2 fields to map - Name and Age) in the Grandparent, Parent, Child schema.

Thanks and look forward to hearing back!

Will