ONNX conversion of multi-ouput classifier

Hi,
I am trying to do onnx conversion for multilabel model using the multioutputclassifier
`model = SetFitModel.from_pretrained(model_id, multi_target_strategy="multi-output")`.
When I tried `export_onnx(model.model_body,
model.model_head,
opset=12,
output_path=output_path)`, it gave me an error indicating there's no `coef_`, I understand there's no coef_ in the multioutput classifier, but is there a way to do onnx conversion for this model?
Thanks!