Azure Migrate now supports the assessment of server inventories imported using a CSV file. Import the servers into Azure Migrate server assessment by adding server details in a CSV file as per the available template—deploying an appliance isn't required. This is useful if you're looking for a quick assessment using CMDB inventory or if you're waiting for approvals to deploy the Azure Migrate appliance. Performance-based assessments can be run as well by specifying utilization values in the CSV.
For more details, read the documentation.