The add-on provides new custom field types that are not the same as the built-in custom fields. Those can have their options updated over REST, but they're not the core Jira fields.
You'd have to swap your existing custom fields over to the new types.
Hey Atlassian community, I help lead engineering at Sentry, an open-source error-tracking and monitoring tool that integrates with Jira. We started using Jira Software Cloud internally last year, a...
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