I have not tried this but I think we can do this by using the Package Import feature of ACS. Get the Schema XML from ACC and try to import it to ACS using Import Utility. We may need to modify the XML depending on the error it throws.
Adobe campaign standard and classic both use a different format for schema definition. you have to write a custom schema transformer which will transform the classic schema xml into the Adobe campaign standard format.
I would recommend you should define a new data model for standard as this tool works and behaves differently to classic. Create a new schema Data model in a dev environment using UI in Standard and this will be the sure-shot way to ensure that all definition works properly in the standard.