Hi @Nelson Neill and welcome to the Community!
I am unsure what you are referring to with Jira Plan, so just assuming that you are referring to an Advanced Roadmaps plan in Jira Cloud Premium. If that's not what you mean, do specify a bit more what plan you have in mind.
In advanced roadmaps, resolved (the system date that is set when an issue is resolved) is not supported for import into your plan. That is most likely because the focus of the tool is to display and plan open issues over reporting on work that was completed. Resolved issues disappear from you plan automatically by default 30 days after they were resolved.
As a workaround and for reporting purposes, it is a better approach to build a filter in Jira directly (via Filters > Advanced Search). Right there, you can display all fields on your issues in list view, including the date they were resolved.
Hope this helps!
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