TPNS on Mattermost docker localhost (without domain, without Nginx)?

Hello guys,
Sorry for my noob question, for TPNS to work, seem like I need to enable TLS right ?, but how do I setup TLS for Mattermost docker, without domain, without Nginx, I just want to use it in my local network.

My bad, you need to enable trigger notification even you are online in the mobile app