The Taipei Pass (台北通) app has a “service” tab at the bottom where you can report issues from within the app for a variety of categories, from COVID-19 related, to environmental violations, down to parking violations. The form is way simpler than the Taipei police form and I’ve always gotten a response within a few weeks.
Most recently, I reported a big trash pile around my neighborhood that was gross and unsightly. I received a response that it would be cleaned up, anti-littering notices were posted, and cameras will be installed to prevent it in the future. Way to go Taipei!