Azure App Configuration Store - Setting label on keyvalues using Bicep - azure

Question

I'm trying to add values to an Azure App Configuration Store using Bicep. I have an issue where I add a label to a keyValue.
This is my module:
#description('Configuration Store Name')
param configurationStoreName string
#description('key prefix')
param prefix string
#description('key name')
param keyName string
#description('value')
param value string
#description('content type')
param contentType string = 'string'
#description('Deployment Environment')
param deploymentEnvironment string = 'dev'
resource configurationStore 'Microsoft.AppConfiguration/configurationStores#2021-10-01- preview' existing = {
name: configurationStoreName
}
resource configurationStoreValue 'Microsoft.AppConfiguration/configurationStores/keyValues#2021-10-01-preview' = {
name: '${prefix}:${keyName}'
parent: configurationStore
properties: {
contentType: contentType
value: value
tags: {
environment: deploymentEnvironment
}
}
}
There doesn't seem to be any way to add a label, which I want to do to enable filtering.
It can be done when creating KeyValues using the Azure Portal, therefore it should be possible using Bicep.
Am I missing something, or is this missing functionality from Bicep?

Answer 1

EDIT April 2022
The documentation has now been updated
The keyValues resource's name is a combination of key and label. The key and label are joined by the $ delimiter. The label is optional. In the above example, the keyValues resource with name myKey creates a key-value without a label.
Percent-encoding, also known as URL encoding, allows keys or labels to include characters that are not allowed in ARM template resource names. % is not an allowed character either, so ~ is used in its place. To correctly encode a name, follow these steps:
Apply URL encoding
Replace ~ with ~7E
Replace % with ~
For example, to create a key-value pair with key name AppName:DbEndpoint and label name Test, the resource name should be AppName~3ADbEndpoint$Test.
I tried this approach and it works:
#description('Configuration Store Name')
param configurationStoreName string
#description('key prefix')
param prefix string
#description('key name')
param keyName string
#description('value')
param value string
#description('label')
param label string
#description('content type')
param contentType string = 'string'
#description('Deployment Environment')
param deploymentEnvironment string = 'dev'
resource configurationStore 'Microsoft.AppConfiguration/configurationStores#2021-10-01-preview' existing = {
name: configurationStoreName
}
var keyValueName = empty(label) ? '${prefix}:${keyName}' : '${prefix}:${keyName}$${label}'
resource configurationStoreValue 'Microsoft.AppConfiguration/configurationStores/keyValues#2021-10-01-preview' = {
name: keyValueName
parent: configurationStore
properties: {
contentType: contentType
value: value
tags: {
environment: deploymentEnvironment
}
}
}