While I know it's almost an extinct element of the language these days, i've been trying for a while to document it in a way it can be remotely useful, and for someone who doesn't speak Vietnamese natively the resources on it are quite sparse (Glossika, the Nom Foundation, and the effort I've got going on LingWiki for the most part, from what I've seen). Language preservation matters aside, adding the information would be of great value to people with backgrounds in Chinese or Japanese trying to learn Vietnamese, as it'd help give them a visual element to associate with the word in addition to a hint as to the pronunciation.