az apim create cli command does not have option to set the specific vnet

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.62

**Describe the bug**
"az apim create" CLI command does not have option to set the specific VNet.
VNet type using the option --virtual-network {External, Internal, None} but if we choose, External.
But does not have a way to associate a specific VNet/SubNet to the apim.

**To Reproduce**
Create a APIM using Azure CLI
az apim create --name apimx --resource-group rgy --virtual-network External

**Expected behavior**
Should have had option to set the specific VNET and specific SubNET

**Environment summary**
Shell Type - bash
Bash on windows 10
CLI Version - latest (2.13.0)

**Additional context**
Could you point me to the documentation to achieve this or provide sample apim cli command to achieve this..