pxt-calliope/libs/servo/targetoverrides.ts

namespace servos {
    //% block="servo P0" fixedInstance whenUsed
    export const P0 = new servos.PinServo(pins.P0);
    //% block="servo P3" fixedInstance whenUsed
    export const P3 = new servos.PinServo(pins.P3);
}