I solve the problem with https://wordtohtml.net. I copy the text into this website then it converts rich text to HTML and I can pass it into Joplin. Now I can use Rich-text editor in Joplin and nothing will be destructed if I use markdown editor.
Also, web-clipper can not solve this problem because it converts rich-texts into markdown and this time styles of rich-text will be destructed, and highlights will disappear.
I think Joplin should create something to solve this problem. I think it's a new feature for Joplin.