The previous available "Express with Advanced Services (SQLEXPRADV)" was only including as addition the Reporting Services (SSRS), that was all.
Since version 2017 the "common" SQL Server and SSRS installer are separated, you do not longer get one complete installer.
Download the separate SSRS installer and install it as free Expree Edition.
You get it at https://www.microsoft.com/en-us/download/details.aspx?id=104502