I like it. With &init_script=... it will be possible to create examples for themes / custom styles / animations and other stuff that share the same main script.
It would be nice to see both init script and main script in the editor, maybe something like this:
##### init script ###
import lvgl as lv
# ... the rest of init script
##### main script ###
btn = lv.btn(lv.scr_act())
# ... the rest of main script