Can I have some model implementation on the provisioner device?
Yes you can. This is for instance what we did with Provisioner and Client in the simple on/off example in early versions of nRF5 SDK for Mesh. We have split that functionality in separate Provisioner and Client examples since then, but it is fully possible to combine Provisioner with model implementations in a BT Mesh node.
is there any tutorial or any indication how to implement a model to send data from provisioner to the other nodes ?
For the provisioning process, we have Provisioning process and APIs.
For implementing a model we have Creating new models.