Others have said no, but I think you can. The ".NET Framework compatibility mode"[0][1] was introduced in netcore2.0 (which actually is now quite a long ago, geez), which means that if your libraries don't use some windows-specific APIs/functionality, like WPF, there is a big chance that you can use them just as they are. I have never used my own .NET framework library like that but I think have used some 3rd party library targeting .NET framework in production.