interface with magma

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I would like to do some descent calculations via magma, and to do so I require magma to assume GRH. If I am just in magma, I can do

SetClassGroupBounds("GRH");

however in sage I'm not sure how to set this. I tried (in sage) magma.SetClassGroupBounds("GRH")but it says "User error: Identifier 'GRH' has not been declared or assigned".

If I try magma('SetClassGroupBounds("GRH")'), it gives "Runtime error in 'SetClassGroupBounds': Bad argument types (possibly calling function signature of intrinsic as a procedure); Argument types given: MonStgElt"

Any ideas or insights would be greatly appreciated! Thank you for your time!