pid/tid string format support

hi author,

I'm looking for a tool to replace chrome://tracing, and GPT tell me speedscope is a good interactive. i have tried to use speedscope to open a chrome://tracing file but failed to show the timeline, and I found the reason is :
my json file uses string as "pid" and "tid" field. (chrome://tracing works) I tried to hack your code local but failed (I'm a EE guy) don't know any knowledge about Js? or the chrome.ts file, so open this question to ask for offical support for "string" pid and tid, could get your response, thanks!

one more thing, the reason I'm looking for a chrome://tracing alternatives is chrome only supports "pid" and "tid" my fundamental requirement is want to have more ID hierarchies: like Pid->Tid-> Aid-> Bid .... which could be customized any ideas are welcome.