Comcast Ventures, the 20-year-old investment arm of media giant Comcast Corp. whose portfolio includes unicorns Away and Hippo, is betting that bringing more specialists in house will set it apart. To that end, it has created a new arm called Forecast Labs. Led by Arjun Kapur, growth partner at Comcast Ventures, it offers a range of services including media buying, data, strategy, and hiring. (A separate goal is to launch new consumer brands of its own.)