设置cmake标志的Conanfile.py？

from conans import ConanFile, CMake

class MyPackageConan(ConanFile):
    name = "my_package"
    version = "1.0"
    settings = "os", "compiler", "build_type", "arch"
    generators = "cmake"

    def configure_cmake(self):
        cmake = CMake(self)
        cmake.definitions["ENABLE_FEATURE_A"] = True
        cmake.definitions["ENABLE_FEATURE_B"] = False
        cmake.configure()
        return cmake

    def build(self):
        cmake = self.configure_cmake()
        cmake.build()

    def package(self):
        cmake = self.configure_cmake()
        cmake.install()

    def package_info(self):
        self.cpp_info.libs = ["my_library"]