Depending on the age and model of the smart TV, you may be able to install the Apple TV app.
I think the oldest supported Sony TV model is from 2018, meaning that earlier models would not have the option to install this app. Try finding the app in the Google Play Store on your smart TV, by searching for ‘Apple’.
Can I use the Apple TV app or Apple TV+ app with my Android TV or Google TV? - Sony Support
If your model TV is not among the supported models, then the alternative is to connect an external HDMI steaming device, that supports Apple’s app. Such an external streaming device could be the Apple TV box, Roku, Fire TV, PlayStation (4, 5), Xbox (One, One S, X, S), ‘Chromecast with Google TV’-dongle, Nvidia Shield TV, or select cable boxes that support apps.
Get the Apple TV app or Apple TV+ app on your smart TV or streaming device - Apple Support
Watch on these smart TVs and third party streaming devices - Apple Support
All the ways to watch Apple TV+ more - Apple Support