AEM Cloud - Unable to make Featured image field mandatory in page properties

Hi All,

I have a requirement to make the featured image mandatory on AEM cloud instance, so that the authors will be forced to upload the image at the time of page creation.

I tried by adding required {Boolean} true to the file, but I can only see the '*' sign shown up next to the Image field name, but authors can save/create the page, even without uploading any image.

Can anyone please help or advise. Thanks in advance.