Lex Slack Integration - responding to Slack's app_mention event

Hi, is there a way to get a Lex bot to respond to the app_mention event from Slack?

I would like to be able to @mention my bot in a Slack channel that the bot is part of and have the bot respond accordingly.

If I use the message.channels Slack event, the bot will listen to all messages in the channel it's part of, but I was hoping to have the bot be able to just listen to the app_mention event instead.