Pairing and mobbing are wonderful for that! Both inside the company as well as in our global community.
At work I made good experience with cross-team pairs in our internal testing community. We have all our testers embedded in cross-functional teams, so if one tester who knows the product and domain pairs with a tester from another team who brings a fresh perspective and a different approach to testing, then it’s beneficial for both and the product as well. @katrinaclokie wrote about her own experiences with cross-team pair testing. Besides that, I also tested a series of cross-team, cross-role, cross-location mobs for learning purpose inside the company which were super insightful for everyone involved.
When it comes to our global testing community, pairing and mobbing can be applied for learning as well. I facilitated mobs at meetups and conferences, as well as a power learning group I am part of. For any of my personal challenges, I used pairing to great success. For example, on my Testing Tour last year I paired with a whole bunch of other testers from our community with all of us learning a lot from each other. The great thing is that more people are on a Testing Tour these days, like @gemma.hill1987 (Testing Tour) and @punkmik (Testing tour 2019) - reach out to them to give it a try yourself!