I don’t think that this is possible.
I don’t think this feature exist, but it could be propably an item for the idea forum.
I think this option is not yet developed in mendix.But still if you want to see last three activity by particular contributor,Go to corresponding person profile and you able to see Recent Activity
I have also never seen an option like this. However, you can see your own answers in your developer portal > activity > your community activity. This list contains all your forum posts/answers, but also for example app store reviews.