Hello Tyeth, after some more looking on this forum it seems this is a much requested feature and I suppose they are working on it as we speak.
I found this post from juli of last year: SquareLine feature requests (lv_i18n, layouts, themes) - #6 by SquareLine_Support
So back then they expected to release some sort of multi language functionality in Q4 of 2022, which makes me think this is in active development. Anyway I suppose the workaround there still stands, which is to set the labels after initialization to make them use the i18n method…