To my knowledge it is not possible, but you can replace the right indent tab with tab characters and export the XML
Thanks Sanjeev for your quick reply.You may be correct.
I need to pass the generated xml output to indesign server and reimport into server if we used tab then in server side document "Right indentation Tab" gets lost and generates a wrong preview.
I dont't know, if it will help, but IDML/IDMS is showing the Right Indent Tab as <?ACE 8?> in the IDML code like that:
For other special characters see:
Also see the following discussion here revolving around your problem a bit: