複数のチャンネルをレイヤーに移動する方法

Does this help? 

// create layers from channels;
// 2020, use it at your own risk;
if (app.documents.length > 0) {
    var myDocument = app.activeDocument;
    var theChannels = myDocument.channels;
    var theBlack = new SolidColor();  
    with (theBlack.rgb) {red = 0; green = 0; blue = 0;};
    var theWhite = new SolidColor();  
    with (theWhite.rgb) {red = 255; green = 255; blue = 255;};
    for (var m = theChannels.length - 1; m >= 0; m--) {
        try {
            var thisChannel = theChannels[m];
            if (thisChannel.kind == ChannelType.MASKEDAREA) {
                var thisLayer = myDocument.artLayers.add();
                thisLayer.name = thisChannel.name;
                myDocument.selection.selectAll();
                myDocument.selection.fill(theBlack, ColorBlendMode.NORMAL, 100, false);
                myDocument.selection.load(thisChannel, SelectionType.REPLACE, false);
                myDocument.selection.fill(theWhite, ColorBlendMode.NORMAL, 100, false);
            } 
        } catch (e) {}
    }
};