Here is my command line :
lean backtest "test_lean" --extra-docker-config "{""Volumes"": {""/stock_data"": {""bind"": ""c:\\_stock_data"", ""mode"": ""rw""}}}" --verbose --debug debugpy
it won't show any error, but when I paused in debug and login into docker container, the /stock_data has no data, also checked the container volume, it don't have the stock_data volume.
Also hope this option can also add to 'lean live', 'lean research` command line, so that we can use external data in all stage.
Thanks