How to Get Text Value from PlateJS

I found PlateJS has API to desrialize string html into editor values:

editor.api.html.deserialize({element:"<p>Hi!</P>"})

I need a method in reverse, so it takes the value after change and convert it to plain string html like:

"<p><strong>Hi!</strong> It's me.</p>"

How can I achieve this or convert children to string?

onValueChange pass a value with this type {value: ValueOf<E>} where value has children property.