Zing! Btw, it looks like there is an additional relationships resource that would expose the attribute rule properties within a feature service in the ArcGIS REST API, introduced at version 10.7. So, maybe they are planning to implement what you are talking about soon.
https://developers.arcgis.com/rest/services-reference/relationships-feature-service-.htm
An Esri developer? Joking
Ahjung
Excellent idea! This just came up for me at work. Why on Earth would someone downvote this idea???
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