Dual dimension display style

Hi, I am working on drawings where the customer standard requires Dual dimensions. I have a problem here with separator. I need to put Inch dimensions with "." separator & metric dimension with "," (COMMA) as separator. If I change the separator to COMMA in TOOLS>OPTIONS>GENERAL, all the dimensions (including inch dimensions) are getting COMMA as separator, where as Hole callouts are appearing correctly as I needed. Does anyone know where I can set "." separator for inch and "," separator for metric dimensions ?  Can anyone help me please?

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