Mapping Nested Custom Fields in Webbook Integration - How To Extract Values To Create Custom Variables Setup?

I have a custom webbook that posts data to Make.com

Within the output bundle I have various custom fields.

When I add other modules within the scenario, the custom fields are not listed which means I can’t use the custom data within these fields to populate other elements of my scenario.

I have never have this problem before, I’m guessing it might be because the custom fields are nested.

The collections within the custom fields array may change position, the ID’s will the remain the same. So I think the best option is to specify the IDs rather than the collection position, I could be wrong?

Is it possible to extract specific IDs (285272,948284, 875976, etc) and their corresponding values from these customer fields and create custom variables?

I’m very much a novice so clear steps would be very much appreciated.

Thanks