Looking at your shared dataset, I think it was uploaded as a canonical dataset 3 and not a community provided dataset (instructions to upload dataset). Please correct me if I’m wrong.
Answering your second question, if you want to link a dataset and a model, you can simply change the model card in the model repo (README.md). For example:
---
datasets:
  - bookcorpus
  - wikipedia
---

Here is an example 1