How to add a prefix to User-Name before proxying to another RADIUS server?

[Clark J. Wang]

I have two RADIUS servers rad_1 and rad_2. For some users rad_1 needs to
forward the requests to rad_2 and I want to add some prefix like `QA/' to
User-Name before forwarding to rad_2. Does FreeRADIUS support that? And how
to configure?

Thanks.

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