Thank you for your question.
I can confirm that ScriptRunner for Jira Cloud is only able to make calls to the Rest API's which Atlassian provides inside of the Jira Cloud Rest API documentation page located here.
I have looked at this API and can see that there is no API to call Crowd directly but that they do provide the API located here to get a user's properties which may allow you to retrieve the information which you require.
I would advise tho creating a support request directly with Atlassian to ask if there is any other Rest API's which can be used to pull user data from Crowd.
I hope this helps.
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