Hi @Sae In Choi ,
Welcome to Microsoft Q&A forum and thanks for using Azure services.
As I understand from the ask, you want to if there are other ways to Migrate Azure Maria DB to Azure MySQL.
Since you have already mentioned about Migrate your MariaDB database to an Azure database for MariaDB by using dump and restore, you may explore this and let us know if you face any issue.
Additionally, if you want to suggest any feature into the Migration of Maria DB to Azure MySQL, you are recommended to share your valuable feedback at the Azure MySQL DB Feedback Channel so that the concerned team will look into the request and implement depending upon the Up-Votes and importance.
Do let us know if further queries.
Thank you.