I really like how notion.so allows simple calculations - and other things - in tables; nothing fancy, just some basic things. So, yes, I would like to see this implemented to Evernote too.
I have the same problem with the web clipper 6.8.1 (f9f083e/1.1.0.926); I tried some articles on Amazon COM and DE with Chrome (51.0.2704.103 (64-bit)) and Opera (39.0.2248.0) on Mac OSX.