Error to create a Databricks datasource using Power BI Rest API - azure-databricks

Question

I successfuly used the "Gateways - Create Datasource" (https://learn.microsoft.com/en-us/rest/api/power-bi/gateways/create-datasource) method from Power BI Rest API to create a SQL datasource, but I´m stuck when I try to create a Databricks datasource.
I saw that there is no Databricks datasource kind, but it could be possible to use the kind "Extension". So a try this code:
OBS: I generated the credential part using the data gateway publick key and a Databricks key.
What am I missing, or doing wrong?
{
"datasourceName": "Databricks AIDA Teste",
"datasourceType":"Extension",
"connectionDetails":{
"path":"{\"host\":\"adb-xxx.azuredatabricks.net\",\"httpPath\":\"\\/sql\\/1.0\\/warehouses\\/xxx\"}",
"kind":"Databricks"
},
"credentialDetails": {
"credentialType": "Key",
"credentials": "xxx",
"privacyLevel": "Organizational"
}
}```
{
"error": {
"code": "BadRequest",
"message": "Bad Request",
"details": [
{
"message": "Unexpected character encountered while parsing value: {. Path 'connectionDetails', line 4, position 30.",
"target": "datasourceToGatewayRequest.connectionDetails"
},
{
"message": "'datasourceToGatewayRequest' is a required parameter",
"target": "datasourceToGatewayRequest"
}
]
}
}
Many thanks!