Modify redis.Cmder content in hook

Question

I want to add some prefix on redis keys in BeforeProcessFunc hook before access, but I find there is no way to modify redis.Cmder? How to do it?

I try to use (https://goplay.tools/snippet/rIpK1R2mYA1) but get a panic error:

panic:reflect: call of reflect.Value.Elem on slice Value