How to add custom tag for network errors sentry/node

[itshadee]

Hi there, hope you're all doing well.

We have a timeout error event in our sentry events dashboard, now we want to analyze those events (around 900k), but in Discover I can't add the API which timeout occurred on, like in the event itself it shows the api in Breadcrumbs section, but I can't add it to columns in Discover and then export and analyze it.

So I decided to add the api as a custom tag to our sentry express/node sdk, but I'm confused and don't know where to add it.
Simply what I'm asking for: how to send the api path which errors happen after calling that in our app.
Appreciate any help.
*sorry for poor english.