Where one should get pretrainded GluonTS models?

Hello, from time series extension documentation (https://djl.ai/extensions/timeseries/docs/forecast_with_M5_data.html) it seems that you can just take and load a saved (to file) model pretrained with GluonTS.
First - there is no information about export format in DJL documentation.
But if you dig in to GluonTS documentation, it becomes clear that there is no method for exporting in some universal format. Instead, the predictor can be serialized using pkl. This format does not guarantee that it can be deserialized even in another version of GluonTS.
So my question: **how do you suggest to gain saved models from GluonTS to impot it in DJL?**