How can I passed editor $getRoot().__cachedText to parent?

[Michael-indochat]

Hello everyone! I'm currently facing an issue that I'm hoping to get some help with.

Here's my code example: CodeSandbox Link

I'm attempting to pass $getRoot().__cachedText to the parent component, but I'm not sure how to go about it.

Can anyone provide some guidance or suggestions? Thank you all in advance!