build.gradle.kts

 ... 
Android {
 buildTypes {
        debug {
            buildConfigField("String", "API_SERVER", "\"http://10.0.2.2:3000/\"")

        }
        release {
            buildConfigField("String", "API_SERVER", "\"https://www.prod.xxxx.xxx.xxx/\"")
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
        create("local") {
            initWith(getByName("debug"))
            buildConfigField("String", "API_SERVER", "\"http://localhost:3000/\"")
        }
    }
...
}
...