Dealing with multi dimensional morph target vertice arrays

Hello,

Three.js expects this as a valid format for morph target vertices:
"morphTargets": [{ "name": "morph_Group1", "vertices": [3.13364,-9.72623,176.129,3.90474,-9.64007,175.921,4.46922,-9.57699,175.353,4.67584,-9.55391,174.577,4.46922,-9.57699,173.802,3.90474,-9.64007,173.234,3.13364,-9.72623,173.026,2.36255,-9.81239,173.234,1.79806,-9.87547,173.802,1.59145 …etc}]`

But the export I have is in the format of multi-dimensional array:
"morphTargets": [{"name": "morph_Group1", "vertices": [[3185, 0.0, -0.0006, 0.0], [3207, 0.0, -0.0109, 0.0004], [3208, 0.0, -0.0075, 0.0002], [3209, 0.0, -0.0024, 0.0001], [3210, 0.0, -0.0077, 0.0008], [3211, 0.0, -0.0006, 0.0], [3212, 0.0, -0.0005, 0.0], ...etc}]

Does three.js have a way of accounting for this type of export? Right now I’m getting:
THREE.BufferAttribute.copyVector3sArray(): vector is undefined

Thanks.