Tuya Dimmer not supported

[lihyt8]

I'm trying to get a recently purchased Tuya dimmer switch to work, but it seems to be not supported.
Zigbee Model: TS0601
Name: _TZE200_6fjev1mn

It is a single gang dimmer with push buttons for on and up/down. The photo from this page (https://www.zigbee2mqtt.io/devices/TS0601_dimmer_1_gang_3.html) is exactly identical to my dimmer, but note that it is a single gang dimmer (not 3 gang as mentioned at that URL).

I have been trying to make an external converter to get it to work, but despite my best efforts I keep getting messages saying the external converter format is invalid.

I suspect that it may just need _TZE200_6fjev1mn added to the definition for TS0601_dimmer_1_gang_1 in Tuya.ts

Please could someone help?