w00t, it's working!
Fantastic quickness on the response and fix YellowAfterlife. Super impressed.
(edit:)
I am having an issue where it is only working in debug mode.
Trying to tinker with it now and figure out why...
That's because the script/event names are obfuscated in release (as far as debug_get_callstack is concerned), even though there's enough information to offer them.
This should be fixed in one of the future runtime updates, but for now there's my free extension which partially mitigates the problem (makes it work for scripts) https://yellowafterlife.itch.io/debug-get-callstack-js