I need HR and Movement data to do some testing before the actual app. How can I access them, given 27.4 of Guidelines?

Point 27.4 of the App Store Review Guidelines reads:

"Apps may not use or disclose to third parties user data gathered from the HealthKit or CareKit APIs or from health-related human subject research for advertising or other use-based data mining purposes other than improving health, or for the purpose of health research"

Now, when the app will be ready for release I only intend to read the data and process it directly on the phone.

However, for the purpose of testing I need to extract the data, get it on some excel / csv file and analize it.

I initially thought to send the data to Firebase, but was told this might breach 27.4.

I only intend to have this feature in the beta I'll release on Test Flight for myself, but still Apple might refuse it.

What alternatives do I have?

1. Can I save the data locally on my watch? Might be quite heavy (monitoring up to 8 hours) How do I get it to a computer then?

2. Can I send the data to iCloud?

I won't be developing the app first hand, I'm hiring someone so I need to understand what is feasable.

Thank you for your help.