Please use the preformatted text option in the editor when pasting code of JSON as its stops everything from being aligned to the left. Can you also close out the JSON tags, so its valid JSON. This way, we can cut and paste into a request and send it to Postman Echo which will give us the same response to work with.
Postman uses JavaScript under the hood, so this is where you need to look for solutions.
The terms are under the “Details” array. You can use the JavaScript find or filter function to search for the term that you want to assert against.
Have a go at that. If you run into problems targetting the values, please post what code you’ve got, plus a valid JSON response and I will help you from there.