A bot on your Facebook group?
No, it is not possible to install a chatbot on a Facebook group, only on a company’s page (business) and its Facebook Messenger account.
However, you can encourage users of your Facebook group to open a conversation with your chatbot Botnation not posts on your group with the link to the Messenger account managed by your chatbot.
Posts on a page automatically add the “Start a conversation” button if needed.