Getting custom field settings using jira API

How can I get background color and emojis set in values for custom field? I am using Jira API “/rest/api/3/search?jql=filter=99999”
This gives me the value of custom fields but doesn’t give background color or any emoji used in value.

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Jira Cloud now has native support for custom fields with colored backgrounds and Emojis??

When was that feature added @JigarBaraiya?