I haven’t used those tools in years, and not with a 5.x kernel. However, it is very likely you need to know about the Magic SysRq feature. The following was related to using sysrq, although in a different context:
https://forums.developer.nvidia.com/t/enter-oem-interface-after-reboot/235298/34
This is related, and might be the addition to the above which you need:
https://forums.developer.nvidia.com/t/save-kernel-crash-and-panic-dmesg/235540
Note that not all sysrq features are implemented on every o/s, and some may not even be enabled without a setting in “/etc”, but here is a more general list of sysrq information:
https://en.wikipedia.org/wiki/Magic_SysRq_key
Note that either key bindings or an echo of the right value to a file in “/proc” will trigger the bindings which are active. Various kernel information dumps will be available depending on architecture and o/s.