Add META tag info for Facebook Instant Articles inside of js

Question

I have a website that is built on a customized CMS from a company (I think it's a chopped up version of WordPress or something) and they won't add in a simple line of code for a meta tag inside of our HTML.

I wanted to ask how I can insert Facebook's Instant Articles META tag into the one file our CMS company allows, which is an override.js.

Is this possible? If so, how could I do that? I simply need the following added:

<meta property="fb:pages" content="1234567890" />

Answer 1

No, that is not possible.

The Facebook scraper tool that reads this meta data does not care for JavaScript; all the meta data has to be part of the HTML your system returns when the URL is requested.