I want to show dropdown list with values in a custom sidebar app installation page but can't find the documentation in the manifest reference. https://developer.zendesk.com/documentation/apps/app-developer-guide/setup/#type
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Are you looking for the agent to select their own role plus additional values? Or are you only looking to add additional parameters after enabling role restrictions that affect the UI elements? Also, are these role specific parameters?
My first thought is if this is something that won't be changing once installed (which I assume wouldn't be since it's linked to an agent's role), I would look at maybe adding it as a requirement? You can check out how to do that here.
If you feel that doesn't fit your needs or my interpretation of your use case is incorrect definitely let me know.
Best,
Erica