How to use PlatformIO to open the SDK of the ESP8266 RTOS?

I have installed the PlatformIO plugin in vs, and also created a new esp8266 RTOS project and compiled it, now how to open or port the esp8266 RTOS SDK to the PlatformIO project?

I don’t quite understand this part? What do you want to port? The ESP8266 RTOS SDK (a very old version btw, not the newest one) is already built with the project. The files are locally in C:\Users\<user>\.platformio\packages\framework-esp8266-rtos-sdk.