Keep css class on Quill clipboard.dangerouslyPasteHTML

I use the Quill Text Editor, and i use the method clipboard.dangerouslyPasteHTML for paste HTML in the editor, but if i send this :

let content= '<p class="perso-class">test</p>'; quill.clipboard.dangerouslyPasteHTML(content)

Editor contents show as: <p>test</p>, i want to keep the custom class CSS.

Thank you for your help !