Hello!
This might also be some long shots but this one also covers USAAF but i don't know in what extent yet. Try contact them.
https://www.forces-war-records.co.uk/
I also read this at Bundesarchiv.de
"Personal references with respect to former prisoners of war in German custody As a rule documentary evidence on captivity as a prisoner of war is stored in the archives of the soldiers’ home countries; however, the Abteilung PA also keeps documentation on prisoners of war in German custody."
Bundesarchiv, Abteilung Personenbezogene Auskünfte (Abt. PA), Berlin, Email:
poststelle-pa@bundesarchiv.de
Regards
JohanSWE