Feature for word/google addon: add default/custom text prompt

[razielaka]

I understand the script isn't supposed to be complicated. However, it would be interesting if you were to add the ability for the user to choose additions to the prompt such as "Check this text for grammatical mistakes", "Explain this like I'm a 3-year-old", "Rewrite this with a formal/casual/etc. tone", or "Translate this into fluent English"...
I've already made some simple inelegant changes to add a few more context menu items for my own purposes, but it would be cool to have by default.

Great script by the way!