Convert from PyTorch toTensorflow

Dear All,

I would like to ask, Is there a way to convert the PyTorch model to TensorFlow 1.x / 2.x without passing through ONNX? Because the generated graph by ONNX is not optimized, it usually adds cast, reshape, squeeze, and unsqueeze operations for the graph.
My main concern is about converting nested models that have nn.sequential(*[layers]) inside their architecture!