meanwhile I did the trip. In CDG at the AA checkin counter they said it is not possible to combine a baggage routing on two Oneworld tickets. As I insisted and said it is possible she went to the manager who reassured it is not possible.

unfortunately my trip to GRU got delayed in MIA by 4 hours so that we missed our second flight booked with LATAM.

But there This was the only good Oneworld benefit. We received a paper from
AA that it was their fault and LATAM rebooked us to the next
available flight to GIG even though it was a separate but Booked ticket.

Unfortunately the next available flight was
in the evening and we had to kill 8 hours in GRU. No lounge, no shopping mile only a nail studio,
a food court and a red lobster to kill time.