Play the file using a versatile media player such as VLC Media Player or KMPlayer .
A search of official streaming data indicates that neither Croatian nor Serbian subtitles are provided in the default audio/subtitle package on Apple TV+. Shantaram (2022) Croatian, Serbian subtitles
Disclaimer: Third-party subtitle files are community-created and must be manually synced with your local media player. 🛠️ How to Use External Subtitles Play the file using a versatile media player