So, open ToolBox and right click on the empty any empty area, for instance, on "General", choose ChooseItems then after loading press Browse and go to your solution folder right to the "packages" folder. Here is an example of the path:
"...Application\packages\Microsoft.ReportingServices.ReportViewerControl.Winforms.150.1652.0\lib\net40". After you reach it find file named "Microsoft.ReportViewer.WinForms.dll" and choose it. So, here we are! All that we should do is to type "ReportViewer" in the search bar of the toolbox and drag it :)

p.s. This solution's considering that package is installed per se