Personally when I have my MC in the first person know something the reader does not, they explain it without dialogue. Some people would call it info-dumping, but if you spread the information out it can feel natural.
I’ll sometimes sprinkle in the character’s thoughts on the subject too.
Example from my WIP
My thoughts shift back to the unity between the gangs.
The rumors are now confirmed that they are uniting but it is hard to tell whether it is under one banner when they still have their individual markings. The City of Ryker is a unique place to have a lot of smaller gangs mixed in with larger ones. There already seems to be a degree of understanding between them.
As far as I know, all gang wars between the different factions have ended, and now there are only rare small conflicts. Most smaller gangs should absorb into larger ones, but this is different. They are actively helping each other. It does not seem to be a business arrangement; it looks like cooperation.
I’d recommend joining our monthly discussions in the future. It’s a great place for feedback IMO.