Selenium Box is a browser and mobile execution environment. The decision if a test is passed or failed is not taken by Selenium Box but rather by the client side (e.g. CI system). Therefore it makes most sense to use a client side reporting tool (e.g. Allure, Extent) to visualize the test results.
Selenium Box also provides an option to pushing the test results from the client to the Selenium Box. We however discourage this option in favor of client side reporting.