So I tried to build and test it on my GTR3. The result is that it can be enabled on the GTR3 as well, but the image size is larger than the GTR3 because the GTR4 has a larger screen size ( 466x466).
In my opinion, I think the GTR4 still uses the GTR3 dial script style.
I have attached the files that I have created in this "topic". Anyone interested can download it.
Spoiler


Original pack from Official : Unpack Original bring out only watchface : This is a file generated from SashaCX75's editor by converting the size to 466x466.
viewtopic.php?p=11643#p11643 I'm not sure if it works in GTR4 or not.
But expect it to work as GTR4 still uses the same zepp OS as GTR3.