Since Plesk Onyx you will be able to install memcache as a Docker container and configure http(s) proxy rule for it to map to your web app.
Docker and proxy rules are available in Plesk Onyx Preview already, you can try it here https://talk.plesk.com/threads/plesk-onyx-preview-and-feedback.337172/
Thank you for your input. We will consider the possibility of implementing this feature in upcoming releases.
Thank you for your input. We will review this php framework to see if we should support it out of the box.Anonymous commented
Totally support this. One of the best frameworks --it takes some time to installe it in Plesk though.