Dynamically make a property mandatory if another property is marked as "true"

Questions
1

On an Article document type, I have a property called “Promoted” that is a true/false field, and two date pickers properties called “Promotion Start Date” and “Promotion End Date”. If the content editor marks the Promoted field as True, then I would like Start Date and End Date fields to be mandatory. Is this possible?

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This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/76160-dynamically-make-a-property-mandatory-if-another-property-is-marked-as-true