So far LLN does not support import of subtitles, but if you really need to read the subtitles in advance, it might be worth the effort to install Tampermonkey/NetflixSubLoader, download the subtiltes, unzip it and use the online service Convert Subtitles to Plain Text, to print the subtitle out as plain text.
@AOEChamp, A member of this forum made a script to run with the Chrome extension, Tampermonkey
4.12. If you install it lets you download Netflix subtitles in one file.