How to find handle of instagram account from user hash in downloaded data

Question

Apologies in advance if this question is not appropriate for stackoverflow.com

I am looking through my downloaded instagram data in JSON. Within the massive zip stores my instagram direct messages under /messages/inbox/<name>_<hash>/message_1.json, and I am trying to find the handle of the user. However, I realised that it doesn't exist in the downloaded data.

For example, in my downloaded data there is a folder at /messages/inbox/williamlin_q1pfmnzw9w, which contains my conversation with https://www.instagram.com/tmwilliamlin168/. However, the handle tmwilliamlin168 never appears in my downloaded data. So my question is how to find it?

I suspect that it might be related to the hash q1pfmnzw9w at the end, but I am unable to relate the hash to either the username or the user id 25569171238 (found here). An observation about the hash is that it is in the form [0-9a-z_\-]{10}.

Thanks for your help.