Well the new customization component looks promising. Although one issue. After customizing an entity and writing into my existing customization.yaml - all my cyrillic text got converted and now the instead of characters i get unicode codes like below. Is that an intended bug?
switch.plug_158d000123e09e:
friendly_name: "\u0421\u043F\u0430\u043B\u044C\u043D\u044F \u0443\u0432\u043B\u0430\
\u0436\u043D\u0438\u0442\u0435\u043B\u044C"
icon: mdi:weather-rainy