Batch export multiple layers in a smart object

The Script needs an instance of the Smart Object to be selected. 

// save jpg for every layer in active smart object;
// 2024, use it at your own risk;
if (app.documents.length > 0) {
    activeDocument.suspendHistory("do stuff", "main()");
    };
////// function //////
function main () {
// get properties, thanks to xbytor;
var myDocument = app.activeDocument;
var docName = myDocument.name;
try {
    var basename = docName.match(/(.*)\.[^\.]+$/)[1];
    var docPath = myDocument.path
}
catch (e) {var docPath = "~/Desktop"};
var theLayer = myDocument.activeLayer;
if (theLayer.kind != LayerKind.SMARTOBJECT) {
alert ("not smart object");
return};
var theSO = openSmartObject (theLayer);
var theLayers = collectLayersNamesIndexAndIdentifier ();
for (var m = 0; m < theLayers.length; m++) {
    showOrHideLayerById (theLayers[m][2], false)
};
for (var n = 0; n < theLayers.length; n++) {
    showOrHideLayerById (theLayers[n][2], true);
    theSO.save();
    activeDocument = myDocument;
    saveJPG (myDocument, docPath, basename, theLayers[n][0]);
    activeDocument = theSO;
    showOrHideLayerById (theLayers[n][2], false)
};
theSO.close(SaveOptions.DONOTSAVECHANGES)
};
////// open smart object //////
function openSmartObject (theLayer) {
try {
activeDocument.activeLayer = theLayer;
// =======================================================
var idplacedLayerEditContents = stringIDToTypeID( "placedLayerEditContents" );
    var desc2 = new ActionDescriptor();
executeAction( idplacedLayerEditContents, desc2, DialogModes.NO );
return app.activeDocument
} catch (e) {return false}
};
////// collect layers //////
function collectLayersNamesIndexAndIdentifier () {
// get number of layers;
var ref = new ActionReference();
ref.putProperty(stringIDToTypeID('property'), stringIDToTypeID('numberOfLayers'));
ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") ); 
var applicationDesc = executeActionGet(ref);
var theNumber = applicationDesc.getInteger(stringIDToTypeID("numberOfLayers"));
// process the layers;
var theLayers = new Array;
for (var m = 0; m <= theNumber; m++) {
try {
var ref = new ActionReference();
ref.putIndex( charIDToTypeID( "Lyr " ), m);
var layerDesc = executeActionGet(ref);
var layerSet = typeIDToStringID(layerDesc.getEnumerationValue(stringIDToTypeID("layerSection")));
var isBackground = layerDesc.getBoolean(stringIDToTypeID("background"));
// if group collect values;
if (layerSet != "layerSectionEnd" && layerSet != "layerSectionStart" /*&& isBackground != true*/) {
var theName = layerDesc.getString(stringIDToTypeID('name'));
var theID = layerDesc.getInteger(stringIDToTypeID('layerID'));
var theIndex = layerDesc.getInteger(stringIDToTypeID('itemIndex'));
var theVisibility = layerDesc.getBoolean(stringIDToTypeID('visible'));
theLayers.push([theName, theIndex, theID, theVisibility])
};
}
catch (e) {};
};
return theLayers
};
// based on code by mike hale, via paul riggott;
function selectLayerByID(id,add){ 
add = undefined ? add = false:add 
var ref = new ActionReference();
    ref.putIdentifier(charIDToTypeID("Lyr "), id);
    var desc = new ActionDescriptor();
    desc.putReference(charIDToTypeID("null"), ref );
        if(add) desc.putEnumerated( stringIDToTypeID( "selectionModifier" ), stringIDToTypeID( "selectionModifierType" ), stringIDToTypeID( "addToSelection" ) ); 
        desc.putBoolean( charIDToTypeID( "MkVs" ), false ); 
    try{
    executeAction(charIDToTypeID("slct"), desc, DialogModes.NO );
}catch(e){
alert(e.message); 
}
};
////// show or hide layer //////
function showOrHideLayerById (theID, theVisibility) {
    if (theVisibility == false) {var idhide = stringIDToTypeID( "hide" )}
    else {var idhide = stringIDToTypeID( "show" )};
    var desc22 = new ActionDescriptor();
    var list2 = new ActionList();
    var ref8 = new ActionReference();
    ref8.putIdentifier( stringIDToTypeID( "layer" ), theID );
    list2.putReference( ref8 );
    desc22.putList( stringIDToTypeID( "null" ), list2 );
    executeAction( idhide, desc22, DialogModes.NO );
};
////// function to jpg //////
function saveJPG (myDocument, docPath, basename, theSuffix) {
myDocument = myDocument.duplicate("copy", true)
var jpgopts = new JPEGSaveOptions();
jpgopts.embedProfile = true;
jpgopts.formatOptions = FormatOptions.STANDARDBASELINE;
jpgopts.matte = MatteType.NONE;
jpgopts.quality = 12;
myDocument.saveAs((new File(docPath+"/"+basename+"_"+theSuffix+".jpg")),jpgopts,false);
myDocument.close()
};

I want to know if there is a more optimal way instead of saving the smart object of each layer and exporting each image from the mockup file?

Yes. 

Scripting can automate that. 

Please provide the file for testing.