Possible to query REST API on assignmentNumber only

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Hi, we have an integration that accepts assignment ID in one of the input fields which we would like to validate against the assignment table. Looking at the assignment REST API it seems that you have to first go to the employee endpoint to get the assignment details. We do not have the employee number (although we may be able to derive it based on the format resembling the assignment number - but I'd rather have something more robust if possible) so is it possible to query either the assignments or the employee REST API's using the assignment number alone? I have