Anyone knows how can i get an report that tells me from which channel the Marketing Qualified Leads came from?
It depends...do you have RCE?
Keep in mind an MQL will be the sum of all other touches, but sure, that most recent touch that pushed it over is visible. Does that really matter? I tend to doubt that. The only time this would be helpful is if a majority of MQLs happened to respond to the same campaign (or never respond to one).
But if you want to see it, you can do a few things;