React Native Sourcemapping (iOS)

I am trying to setup Sentry with sourcemapping in both my Android and iOS apps.
The logging of errors and userdata is working.

When I go to the docs, to the manual setup page (iOS).
At some point it states:
“Additionally we add a build script called “Upload Debug Symbols to Sentry” which uploads debug symbols to Sentry.”

What build script am I supposed to add here?
Am I too dense to pick this up?

Thank you in advance!

Here are the scripts you have to add: