How to add custom context into html

I want to add custom context /all-product page (eg. All price list)
I try to add below into to extend context but not working.

extend_website_page_controller_context: {
  'erpnext.stock.doctype.item.item': 'mymodule.stock.item.item'

I would like to ask how to achieve this?

Hi @SDLyu, did you find a solution for this?
Thank you

Sadly, no. I create new html page to achieve this.