freeradius accounting of cdr and quotes for string attributes

My question is this, I need to write CDR information out using the linelog module in csv format. The requirement is that all string attributes need to be enclosed in double quotes. How does one go about doing this? If you look at the detailed format, these string attributes are enclosed. But there seems to be no option in linelog module. I am using freeradius v2.1.10. Thanks for any help Kelly