Core Grade Levels API Missing "Promote to Grade Id"

The "Core Grade Levels" API (https://developer.sky.blackbaud.com/api#api=school&operation=v1gradelevelsget) returns a value for "promote_to_code" but doesn't indicate what the next grade would be when a student is promoted normally (if any).

Because of this I either need to create a custom list to pull that info from the API or code it manually. Is there any way this value can get added in to this endpoint?

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