Seeking Dual Boot Tutorial for ThinkPad C13 Yoga 3500c

I am not a native English speaker. The following content was translated by Gemini.
“Hello everyone, I’m new to Chromebooks. I have a ThinkPad C13 Yoga 3500c, and I’ve read online that Coolstar has the ability to modify it for dual booting (booting Windows and ChromeOS). However, on the Coolstar website, I only found tutorials about installing Windows and didn’t see anything about dual booting. I really want to have a dual boot system. Can anyone provide a detailed tutorial? Thank you very much.”