What do you mean by "extract the list"? Export the work items resulted from this JQL search? If so, what export format?
Welcome to the community.
Jira server/DC has no API option for this.
You can look at this KB, https://support.atlassian.com/jira/kb/how-to-retrieve-available-options-for-a-multi-select-customfield-via-jira-rest-api/
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it is drop down list
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