I am afraid this is currently not part of the GoodData product. But the LDM export should be reasonably human readable and can be exported and stored to some version control software like git.
You can export it multiple ways - either manually from the UI or using the python SDK or via API. Also if you use the
command line tool and extension for VS Code, you get each dataset into its own file which can make it even more friendly for this case (note this tool is still beta).