Search by "label", as seen in eventlog2html?

When I run with -hi -l and analyze the eventlog2html, I have a bunch of stuff that I can only describe as 0x15a3b20 - nothing more. Presumably adding more -finfo-table flags to various libraries would give me more information, but it would be great if I could also connect to the process with ghc-debug-brick and just search for one of these labels. Likely seeing a retainer path would give me enough information to start to understand what this thing is.

Do you think this is possible? I don't really know what the "label" in eventlog2html is.