How to modify selected text in Joplin editor

Hey guys, I am encountering some difficulties in developing a plugin as I am a beginner. I am unable to modify the text in the editor using code in the plugin.

I have selected the following text in the editor:

And I want to achieve the following result through a shortcut key:

image

It is a simple function, but I am unable to implement it. Could you provide me with some guidance? Thank you very much!

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