Now, you can use Azure Database Migration Services (DMS) to perform schema migration while migrating to Azure SQL DB from the Azure Portal.
While configuring the SQL migration, if schema migration is enabled, it will allow you to migrate schema objects like schemas, tables, stored procedures, indexes, views, synonyms, DDL triggers etc. to target Azure SQL DB with the data migration. For schema migration to work, you must have SHIR version 5.34 and above installed and registered with DMS services. Currently it is available in DMS via the Azure Portal.