I would probably look at the describe commands and dump them somewhere (s3).
https://docs.aws.amazon.com/cli/latest/reference/quicksight/describe-analysis.html
https://docs.aws.amazon.com/cli/latest/reference/quicksight/describe-dashboard-definition.html
https://docs.aws.amazon.com/cli/latest/reference/quicksight/describe-analysis-definition.html
https://docs.aws.amazon.com/cli/latest/reference/quicksight/describe-data-set.html