template compile issue with jquery script tag

[JayeshGridScape]

template_str = "<p>{{content}}</p><script>\n       var keyPressCount = 0;$(document).on(\"keydown\",function(){\n   keyPressCount++;\n   $(\".texthidden\").val(keyPressCount);\n});</script>"

@handlebars = Handlebars::Handlebars.new
@handlebars.compile(template_str)
Parslet::ParseFailed: Extra input after last repetition at line 2 char 65.
from /home/XXXX/.rvm/gems/ruby-2.7.1/gems/parslet-1.8.2/lib/parslet/cause.rb:70:in `raise'