How can I use local rotation on objects created with geometry nodes?

I have geometry nodes to spawn in objects all over my mesh. Currently they rotate with the mesh, so on a sphere they all point outwards, which I want. But I now want them to be rotated around their 7 axis, so they aren't all lined up. If I use an Attribute Randomize node set to rotation then it resets all their rotations, and they are all pointing directly upwards.

How can I make them rotate on their local axis?