As for now, the cascading field is not allowed to be added in the mapping.
The idea has been raised in 2016 so hopefully it will see the light of a day in 2020. We need this feature to pass the Product and Sub-product information that are stored in Cascading element on Jira side and in related pick-list on the Salesforce side. The lists are equal in content on both sides and if that is a condition to be able to use them in Connector, implementation should not be extremely complicated.
We would like to use this feature!
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