This plugin will make your custom made menu appear next to the selected text. Also, this plugin provides with other features such as
1- Highlight & unhighlight selected text
2- Expose selected text with a state so you can use it as you wish

This plugin is for free but if it helped you, you can buy me a coffee here:
https://www.buymeacoffee.com/ANaser

Full explanation of the plugin is available here:
https://selected-text-menu-plugin.bubbleapps.io/version-test

Feel free to send me suggestions.

All icons are provided by Icons8
https://icons8.com/icon/

Some libraries used in this plugin are under the license available here:
https://github.com/timdown/rangy/blob/1e55169d2e4d1d9458c2a87119addf47a8265276/LICENSE