Highlighting \[...\] pairs in latex

I have ```vim.g.vim_markdown_math = 1``` enabled and inline math with $ ... $ is correctly formatted. However the \[ ... \] delimeters are not supported. How can I fix this?

I tried to add https://github.com/preservim/vim-markdown/issues/98#issuecomment-154521945 into my init.lua but nothing happened, so where should I add those lines to make those delimeters work?