addthis_config / addthis_share values does not work (format?)

Dear developers,

I wonder what is the format of addthis_config/addthis_share vlaues?

So far I use JavaScript in the footer with

var addthis_config = {
        ui_click: true,
     };

var addthis_share = {
   templates : {
      twitter : "{{title}} {{url}} (via @myname)"
   }
}

It’s written at admin page that config/share values should be in JSON format, yet at least this does not work in addthis_config field:

"ui_click": "true"

Could you please provide examples on what should be entered in these fields?

http://ww.wp.xz.cn/extend/plugins/addthis/