How to save JSON to CSV?

Question

I am trying to use a raw data output from mixpanel API and save all events to a .csv. Mixpanel gives me the following data as <class 'str'>:

{"event":"Test Event","properties":{"time":16423986,"distinct_id":"XXXXX-XXXX-XXX-XXXXX-XXXXX","$browser":"Chrome"}}
{"event":"Test Event","properties":{"time":16412321,"distinct_id":"XXXXX-XXXX-XXX-XXXXX-XXXXX","$browser":"Chrome"}}
{"event":"Test Event","properties":{"time":16412311,"distinct_id":"XXXXX-XXXX-XXX-XXXXX-XXXXX","$browser":"Chrome"}}

I would like to have a .csv file with the following, making sure I can select which fields I want (in this case, I would have excluded distinct_id):

event, time, $browser
Test Event, 16423986, Chrome
Test Event, 16412321, Chrome
Test Event, 16412311, Chrome

I have researched other questions but had no success by now, I would really appreciate your help.