We allow canned responses to be added at https://addons-dev.allizom.org/en-US/admin/models/editors/cannedresponse/ But we need to differentiate between add-on specific (AMO) ones and app-specific (Marketplace) ones. In other words, https://addons-dev.allizom.org/en-US/editors/review/animeaddicts-kiegeszitő and https://marketplace-dev.allizom.org/en-US/editors/apps/review/app-365941 should have different canned response choices.
Similar to bug 737540. This is for the backend work to allow canned responses.
For the app-specific ones, just use generic values from the last comment in bug 737540
Rob, I assume
By the way, we can add canned responses in the admin and select the right type. All old responses were set as belonging to add-ons.