IR Blaster is a fantastic technology. It is possible to control a remote control device by a phone if it is IR Blaster supported. If you are using Oppo K10 5G (China) smartphone, then you cannot use this feature because this phone does not support the IR Blaster feature.
Oppo K10 5G (China) is an expensive smartphone that has come up with many new features. But despite being so expensive, this phone does not support the IR Blaster feature. However, many phones use the IR Blaster feature through an app. But there is no confirmation that the app works really. You can try it.