Possible to comment a survey?

Did you mean survey description? You can provide intro and end messages in the survey.

For administration purpose, you can add short comments on each response in the reports section. It is only visible to you.

Nop. I think I misspoke.

I would like to add a comments section just under the survey. When someone respond to a survey they can post a comment either about the survey.

For exemple:

Question: did you like this website?

Answer1: YES

Answer2: NO

Comments section:

User1 said: Yes this is a good website

User2 said: blablabla

...

Enable "Show Custom Answer textbox" option in your question edit page. It will show a textbox below the answers and users can enter their comments in it.

Thanks Maverick but that's not really what I wish.

My Idea is a comments section below the survey just like you have in "Suggest an idea". Users who have voted can tell their opinions about the question in survey.

Like this one for exemple: https://www.mesopinions.com/sondage/sante/pensez-faire-vacciner-contre-covid-19/13576

That's not available.

One alternative is, publish your survey in an article using the content plugin short code and then enable comments on your article with any comments component that you are using.

https://docs.corejoomla.com/display_surveys_in_joomla_articles/ 

Thanks for the idea.

I tried this but when I click on Finish I have the "Please Wait" hanging on and can't do anything, just refresh the page.

That may be different issue altogether. Can you please send me your survey (embedded in an article) URL?

Sure.

https://www.mon-opinion-compte.org/sondages/social01/11-pour-ou-contre-un-nouveau-reconfinement

I noticed that's happening when "Show consolidated reports" was activated. If not shown that's ok. Unlucky I need to show the consolidated reports after submission :(

I see the chartjs library is not loaded. Are you using the latest version of the component? Can you please check if the below code exist at line 158 of plugins/content/surveys/surveys/php?

if($item->params->get('show_report') == 2) 
{
    CjScript::_('chartjs', array('custom' => true));
}