How to add userMetadata via arm template

Customer used this https://github.com/Azure/azure-quickstart-templates/tree/master/201-azure-relay-create-hybridconnection arm template to create a hybrid connection.

He wanted to configure the userMetadata. Cx tried to add the parameters as below, but it is not added to Hybrid connection as expected. Any idea here? Thank you.

"userMetadata": {
"type": "string",
"metadata": {
"description": "userMetadata information"
}

"userMetaData": "[parameters('userMetaData')]"

We can add the userMetadata via portal or in reources.azure.com.

Start by inspecting the 201-azure-relay-create-hybridconnection template linked in the issue and compare its Hybrid Connection resource properties with the Azure resource schema. Reproduce the deployment using the proposed userMetadata parameter, then verify the deployed resource through the portal or resources.azure.com. Done means the template provisions the requested userMetadata value.

Written by the indexing model from the issue text.