CDNs REST API documentation lacks using "Latest" version from Key Vault when using custom domain with custom certificate

When configuring custom domain / HTTP / certificate via the Azure Portal, the UI suggests to set it to 'Latest' to always use the latest version of the certificate stored in Key Vault.

I don't see that this is possible via the REST API:

https://github.com/Azure/azure-rest-api-specs/blob/master/specification/cdn/resource-manager/Microsoft.Cdn/stable/2020-09-01/examples/CustomDomains_EnableCustomHttpsUsingBYOC.json

https://docs.microsoft.com/en-us/rest/api/cdn/cdn/customdomains/enablecustomhttps#keyvaultcertificatesourceparameters

Start with specification/cdn/resource-manager/Microsoft.Cdn/stable/2020-09-01/examples/CustomDomains_EnableCustomHttpsUsingBYOC.json and the linked enablecustomhttps Key Vault certificate source parameters documentation. Compare both with the Azure Portal's “Latest” option; done means the REST documentation clearly explains whether and how the latest Key Vault certificate version is selected.

Written by the indexing model from the issue text.