How to crash an application to produce Crash Report
It turns out that sending SIGKILL (kill -9) to an application is a bit too abrupt, the same goes for SIGTERM (kill -15). Instead, sending SIGQUIT (kill -3) worked, and SIGABRT (kill -6). The application I killed was Activity Monitor, but it should work with other macOS applications as well (The real macOS ones, that ship with OS, Console works and Safari as well). You just need to wait a couple of seconds if the application killed had big memory footprint, because it takes some time to produce the Crash Report.