New Metadata Field.

I want to create a custom field not at the issue level, it should more be like the "Components" or "Version"
filed provided by Jira ,i.e in addition to these two fields at the product level, I wanted another filed called "Features" and then
create these "Features" remotely irrespective of weather an issues is being created or not and when the issues is created it should contain a dropdown containing these "Features" as a list from where the user can select an affected "Feature" for the issue.