Add additional TFM to remove polyfill packages

[thompson-tomo]

Is your feature request related to a problem? Please describe.

I want to minimise dependencies in my project by utilising framework dependencies wherever possible

Describe the solution you'd like

A new TFM is added net Standard 2.1 &/or NET 6 The existing dependencies are only added for net standard 2.0

Describe alternatives you've considered

Accept the additional dependency

Additional context

n/a