What I am understanding is, you would like to create a SQL Server virtual machine (VM) in the Azure portal with SQL Server 2019 Developer edition.
In addition to Alberto's document, you can also refer to the QuickStart document below for creating a virtual machine in the Azure portal.
https://www.sqlshack.com/deploy-sql-server-on-azure-vm-using-the-azure-portal/
Also, please check a short YouTube video https://youtu.be/RwWOIGQgi4s “SQL Server on Azure VM Overview“ (you can watch from timeline ~2:00)
Thank you!