@Michelantonio Thank you for posting your question on Microsoft Q&A platform. Happy to help!
I understand that you want to migrate your Windows VM to Azure without vCenter or vSphere.
Short answer: You can migrate your VM as physical server using Azure Migrate.
Please refer to a similar discussion here - https://video2.skills-academy.com/en-us/answers/questions/686552/migrate-vmware-vm-to-azure that has all the details you need. Hope this helps!