In addition to the map created through the barricade menu, it also supports loading XML files created through the Map Editor by Guadmaz

Download Map Editor by Guadmaz:
https://www.gta5-mods.com/scripts/map-editor

You can find many maps here:
https://www.gta5-mods.com/maps

Note: Only the coordinates of peds and vehicles will be loaded, which means that weapons, models and props are meaningless