Bridge Nginx and Mattermost on the same server

Hello, I don’t know where to look or I can’t find it. How can I change the listening port or my web address url with a non-standard port on omnibus? I have put several posts with the help and nobody tells me anything and this thread is the closest thing to be able to do something similar.

As seen in the image, I need my URL to show another port that I understand should be changed in nginx but I don’t see the way,as noted, I already have the certificate assigned through the Installation script of Mattermost omnibus but as seen in the console those parameters can not be changed there.

These are my posts on the subject in case it is worth reference. I just need my address to be like this: https://mattermost.mydomain.com:2445 where the listening port is this and not a standard 443 one. I don’t know if I explain myself well.

Thank you for the help that will be welcome.