Thank you for your question.
Currently, you can create your own survey using any third party service like surveymonkey.com and include a survey link to email notification about ticket resolution.
Additionally, we are working on feedback feature right now. Once a ticket is closed, a requester will receive a message asking for feedback. Feedback includes estimation of a support level and a comment to provide additional information.
I can’t provide you any due dates but expect this feature to be ready within four - six weeks.