The Windows 10 x64 entry is enough. The description of the Windows 10 checkbox is outdated in that regard, Server 2019 is included in Windows 10.
So,
Windows 10 x64, Server 2016 and Server 2019 are ALL Windows 10 based, so using Windows 10 is correct.
@WSUSUpdateAdmin: Please update the Windows 10 box description to include Server 2019.