Adding FAQ custom csv from Kendra to Lex Response

When uploading FAQ to Kendra, you can use custom a custom CSV as described here: https://docs.aws.amazon.com/kendra/latest/dg/in-creating-faq.html

How can you access the information in the custom columns to be displayed as part of a Response in Lex?

The examples in To create an AMAZON.KendraSearchIntent intent and response message at this link below do not describe this. For example, from basic csvs you can access the result question and answer as part of the a Response in Lex:

I found a FAQ question for you: ((x-amz-lex:kendra-search-response-question_answer-question-1)) and the answer is ((x-amz-lex:kendra-search-response-question_answer-answer-1)).

https://docs.aws.amazon.com/lex/latest/dg/faq-bot-kendra-search.html