Instead of using SQL Server Express please install SQL Server Developer Edition, which is free, and supports memory optimized tables.
Please install SQL Server 2019 and select "Developer Edition" on the Product Key page of SQL Server setup. Please see this article about how to install Developer Edition. You can also perform an edition upgrade from SQL Server Express to Developer Edition read here for more information.
Please apply the latest cumulative update for SQL 2019 before trying to import the bacpac.