Hi,
Can you please add the Skoice plugin into Minehut servers? With that plugin you can doe proximity voice chat in discord. If only the plugin is installed then people can do the rest by him self because on the site there stand what you have to do to add it in discord. I hope you will add this plugin!
Link: https://www.spigotmc.org/resources/skoice-proximity-voice-chat.82861