Android - How to detect "Power Save mode" in Huawei or other devices?

Question

I’m making some optimizations on my app for devices with "power saving mode" enabled.

Here's the sample code:

import android.content.Context;
import android.os.PowerManager;
import android.provider.Settings;

//for MIUI
private boolean isPowerSaveModeMiui(Context context) throws Settings.SettingNotFoundException{
//available for normal or ultra power save mode
//In recent tests, miui use PowerManager.isPowerSaveMOde() on Android S
    return Settings.System.getInt(
        context.getContentResolver(),
        "POWER_SAVE_MODE_OPEN"
    )==1;
}

//for Huawei(EMUI/HARMONY)
private boolean isPowerSaveModeHuawei(Context context) throws Settings.SettingNotFoundException{
    //this is only available for normal power save mode
    //when ultra power save mode is enabled or power save mode is disabled,it returns 1
    return Settings.System.getInt(
        context.getContentResolver(),
        "SmartModeStatus"
    )==4;
    //I can't find any docs for this
}

//for other systems which is api21+
private boolean isPowerSaveMode(Context context){
    return ((PowerManager)context.getSystemService("power"))
        .isPowerSaveMode();
}

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Huawei's cloud debugging platform
https://developer.huawei.com/consumer/cn/console#/openCard/AppService/1045

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log outputs
enable normal power save mode

disable normal power save mode

enable ultra power save mode

An intent was sent but don't know if it's public.

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So how can I detect "Ultra power save mode" in Huawei devices with Settings.System.getInt method(or their own api)?
btw, does Sony/Samsung or others has their own properties for this?
Thx