REST API custom field (radio button) add values - Jira CLOUD

Hello,

I’m created a new radio buttons custom field using REST API. But I couldn’t find an option to add values to it (I want to add values 1-5). Am I missing something?

Reference I used: https://developer.atlassian.com/cloud/jira/platform/rest/?_ga=2.234986305.1599257454.1534919912-53440487.1534055902#api-api-2-field-post

At first I tried the “create issue field option”, it didn’t seem to work, not with “customfield_10039” nor with “10039” as the field key.