See and follow links in this cummunity guide → Zigbee Guide: How-to setup local custom device handler quirks in ZHA integration
Also read → https://www.home-assistant.io/integrations/zha#how-to-add-support-for-new-and-unsupported-devices
Plus for back-story also read → https://www.home-assistant.io/integrations/zha#knowing-which-devices-are-supported
Those in turn lead ZHA Device Handlers project repository on GitHub where can post requests / bugs :