Allow customer to update note on their order

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I am looking for a way to allow Customers to edit their own "Note" on an existing order. This seems like the only option we have for our requirement given we can still not add custom metafields to order Printer pro.

I know there is a way to add via json:[version]=2020-07#update-2020-07

But I have never done this before, and can't find any decent example online with a form as an example.

Does anyone have a working ajax example of how to update the order note?

Thanks in advance.