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Does quill define format for it?

Need the corresponding attribute for it. Please check quill documentation.

We need to make sure web version of react quill can be compatible

So what is it like for underlying json data?

Please go through https://youtube.com/playlist?list=PLbhaS_83B97vONkOAWGJrSXWX58et9zZ2 if you don't understand what I mean by attribute. Again, the first thing is to define json data as in https://github.com/singerdmx/flutter-quill/blob/master/example/assets/sample_data.json

Try https://codesandbox.io/s/3zf03 and you can intercept web traffic to figure out the json

It is possible if you know react

If you cannot figure out the json data, I am unsure what to talk about

This will be my final comment until json data is figure out. Please don't expect me to reply more