Hello Faisal, thank you for your suggestion!
The ability to use custom SVG code as a reaction button is already available in the premium version of the plugin. In the paid version, you can select any image from your media gallery as a reaction icon, and if your site allows SVG uploads, you can use SVGs freely.
Also, as long as the SVG file doesn’t enforce a specific color, the color options will also work with it.
At this time, I don’t have plans to include this feature in the free version, but feel free to reach out if you have any other questions!