Is there a way to add "was this article helpful?" text and vote buttons to topics?

I searched before posting this but didn't see a recent discussion about it.  I may have missed it.

Thank you both for your feedback. 

It's not what you have asked for but you can have a link to initiate an email where users can ask questions or give feedback. That does require support though. 

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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.

I don't believe there's a built in way in Robohelp. Possibly the functionality exists if you also buy Robohelp Server, but if you don't already own it I don't think it would worth getting unless you have extensive enterprise server needs.

You should be able to add a third party tool using javascript, but it's not something I've done so can't help. 

The question has been asked previously, so you could search the forum to see if anyone else has posted a solution. Do note though, that the solutions will likely vary depending on if you are using Classic or New UI.