Purchased a lot of TFT LCDs of various sizes from Aliexpress and had a really tough time building UI using Esphome. After a lot of effort,I was able to create a somewhat working simulator.
https://jnan.co/tools/displaysim/
The interface is fairly simple. You insert commonly used elements like Icons and Text. The tool generates YAML Code. The most difficult part was finding coordinates for the design. This Tool takes care of that and also shows what your screen might look like.
Please provide your feedback.