yes
re-download your map from steam, find it on your drive. the maps i am subscribed to are in "C:\Users\NAME\Documents\My Games\Company of Heroes 2\mods\scenarios\subscriptions"
then use this tool.
https://www.coh2.org/topic/16147/tool-map-extractor
but the maps will not have their names, just some numbers. when you extract the SGA files, you get alot more files in a folder named same as the SGA file you extracted. One of them is SGB, the file you drag into the worldbuilder. If you have many maps downloaded, finding out which of the SGA files is your map can be quiet hard. you just gotta extract and check it on the worldbuilder.