sharepoint online – Power Automate Add new role definition using rest api

I’m trying to create a Power Automate to create role definitions i.e. custom permission level with below body for “Send an HTTP request to SharePoint

{
    'request': { '__metadata': { 'type': 'SP.RoleDefinition' }, 'BasePermissions': 
    { '__metadata': { 'type': 'SP.BasePermissions' }, 'High': '176' , 'Low': '138612801' }, 
    'Description': 'New description', 'Name': 'New role', 'Order': 180 }
}

below is error

An entry without a type name was found, but no expected type was specified. To allow entries without type information, the expected type must also be specified when the model is specified.

Thanks