How to initialize FBoneReference in C++ with a string?

I’m writing customed animation node, which modifies multiple bones.

How can I initialize a FBoneReference given the name of the bone as a string?

I tried FBoneReference bone("boneName"); but it seems to be incorrect, since UE4 crashes when I compile the AnimBP which uses my customed node.

In other words, given the name of the bone as a string, how can I get the corresponding FBoneReference?

Thanks!!!