Validation XML property for Custom React Widget

Hello, I have a requirement to create a custom React Date-Time Widget, Where I need to add the Validation property under package.xml file and should have validation section with type Dropdown with “none, Required, ect.. ” in it and which  is every similar to in-build mendix widget. Searched throughout the Mendix document to get the right property to do it but no luck, can any one please help me out with required validation property to add in package.xml file.   Thanks!!!
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