Can someone please help me know? how can i get the list of available options for the custom dropdown. and what are the specific permissions needed. I have the jira admin access
There's not yet a direct way to get it, because custom fields can have contexts (and some system fields have variable lists), and they're not yet covered by the admin REST API
But, when you have the context, you can issue a simple "get create meta" call, giving a context (project and issue type) and then not bother to create an issue.
I'd take a look at this article for more information about retrieving options through the Rest API. Basically, because a single custom field can have different options depending on the context, Atlassian doesn't have a single API to retrieve all options at once. Instead, you can get the options available for a specific context by calling the create issue meta end point. I believe this does require the custom field to be on the create screen within a project.
The article walks you through more information about what the end point returns.
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