How can I obtain a bone hierarchy array?

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I am using D3D to render the model, and when I try to do bone animations, I only need a bone ID array called boneID, where boneID [index] represents the parent node of the index bone, and I also need the transformation matrix for each bone.
I only need these two things to render the skeleton animation, but Asiimp cannot directly obtain the skeleton ID array. When I tried to obtain such an array, I found that I needed to piece together the bone in the mesh and the aiNodeAnim in the animation. I needed to shape a multi tree based on the mesh name, and the order of bone arrangement may not be correct.
Why can't we directly provide int boneIDs [] and XMFLOAT4X4 toParentMatr []?