Do I have this right? Using the mighty Jira, world conquering market leader, dropdowns can only contain static values entered at design time.
You can't fill it in response to a user's role, or an entry in a text box (yeah I know about cascading dropdowns. That's a small percentage of use cases).
You can't fill it from an external source, like an API.
Hell, you can't even fill it from an INternal source, like a lookup table.
So if the user has to pick from a list of periodically changing data, what are they supposed to do?