Looks like you are missing the workload for “Web development build tools”: Microsoft.VisualStudio.Workload.WebBuildTools
.
You can install it by downloading the build tools installer from here (VS2017) or here (VS2019) then running
vs_buildtools.exe --add Microsoft.VisualStudio.Workload.WebBuildTools
or opening vs_buildtools.exe
and selecting the “Web development build tools” component in the GUI: