Support for exporting paligemma to onnx

[DashaMed555]

Feature request

I’ve tried to export google/paligemma-3b-mix-224 to onnx using optimum. But it outputs: "ValueError: Trying to export a paligemma model, that is a custom or unsupported architecture, but no custom onnx configuration was passed as custom_onnx_configs. Please refer to https://huggingface.co/docs/optimum/main/en/exporters/onnx/usage_guides/export_a_model#custom-export-of-transformers-models for an example on how to export custom models. Please open an
issue at https://github.com/huggingface/optimum/issues if you would like the model type paligemma to be supported natively in the ONNX export."

Motivation

I’ve tried everything but nothing works =(
(Using custom configs, using torch.onnx.export, etc)

Your contribution

Actually, it seems to me that I can’t help… =(

[MengAiDev]

Could you share the config,json. As you know, I'm in China, so you it's difficult for me to access huggingface.