Hey there,

We don't have for it and currently we only have 'Invite Friends' and 'Invite Via Email' in the group. https://take.ms/gllBC

Or do you know if the "Friend Suggest" app can be used for group suggest?

https://stackideas.com/apps/item/369-people-suggest-intelligent-and-intuitive-networking-suggestions-for-jomsocial-community-builder-and-easysocial

This friend suggestion app is developed by Techjoomla, perhaps you can consult with them and see whether this app can able to support it or not?