Adding Markup inside h2 tag

Hey 🙂

I would like to Auto add a further code inside the H2 tag. Because i do this within my visual editor,- my question is if i need to change something in WordPress or in TinyMCE Advanced.

What i would like to do is if i click on the H2 button
that the code would be instead of:
<h2>test</h2>
This below
<h2 itemprop=”alternativeHeadline”>test</h2>

Sincerly Yours

DeexGnome

https://ww.wp.xz.cn/plugins/tinymce-advanced/