Insert MD icons in Gutenberg anywhere. Works with Marketers Delight WordPress theme only: https://gauravtiwari.org/go/md/
Based on the plugin by Joris van Montfort: https://wordpress.org/plugins/jvm-rich-text-icons/
With this plugin you can insert MD icons anywhere in Gutenberg on a site that runs the Marketers Delight WordPress theme. I based it on Joris van Montfort's rich text icons plugin and it's free and open source under GPL-2.0.
If it got MD icons into your Gutenberg content on a Marketers Delight site, you can buy me a coffee.
You can star the repo too, and if an icon won't insert, an issue with your WordPress, PHP and Marketers Delight versions and the steps you followed gives me something to test against.