How to require Alt Text (Alternative Description) when editor selects image in TinyMCE?

Questions
1

My companies website needs to be ADA accessible to a WCAG 2.1 minimum level of AA. One of the big problems is the content editors are not entering the Alternative Description.

  1. I need a way to require the Alternative Description for ALL images. Does anyone know how and where I can set configurations to require the Alternative Description.

  2. I also would like to add a red astrisks in front of the Alternative Description label, though this is less important than the first item.

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This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/113952-how-to-require-alt-text-alternative-description-when-editor-selects-image-in-tinymce