SDP API: How do I look up role IDs for mandatory role fields in a Change template?

SDP API: How do I look up role IDs for mandatory role fields in a Change template?

In order to create a Change via API, I must know in advance which roles (role IDs) are mandatory before I make the POST request. For example, if "Implementer" and "Reviewer" are mandatory, how can I look this up via API?

The change_template layout field shows which form fields are mandatory, but it doesn't provide the role IDs.

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