Get web-mode inside of yo-yo/bel html template strings

yo.el

(defun aj-javascript/post-init-mmm-mode ()
  (with-eval-after-load 'rjsx-mode
    (mmm-add-classes '((yo
                        :submode web-mode
                        :front "html`"
                        :back "`"
                        :face mmm-declaration-submode-face)))
    (mmm-add-mode-ext-class 'rjsx-mode nil 'yo)
    (setq mmm-parse-when-idle 't)
    ))