Hi Marion,
Maya supports OCIO as synColor embeds the OCIO library for config file reading.
Below are some links explaining the OCIO support in Maya & Arnold:
Arnold -> https://arnold-rendering.com/2017/06/01/color-management-in-arnold-for-maya/
Here is the command to query/edit the Color Management settings in Maya:
https://help.autodesk.com/cloudhelp/2017/ENU/Maya-Tech-Docs/Commands/colorManagementPrefs.html
Having an OCIO config file at Maya startup could be done by setting the OCIO env. variable to a specific config file before starting Maya.
Regards,
Patrick.