REST API Datamodels for request_data structure

Using my Dolibarr
1

I’m currently digging myself some more into the Dolibarr REST Api.
On several calls I see on swagger models for the request_data structure.

e.g.

definitions/proposalsCreateLineModel

but where can I find these Models?
I’ve searched in the Swagger UI as well as in the Swagger.json file.
But there’s always only the link to the models.

Best regards
Bastian