The most reliable way to watch the episode with official Hungarian subtitles is through regional streaming services:
Watch Star Trek: Discovery - Season 4 | Prime Video - Amazon.com Watch Star Trek: Discovery - Season 4 | Prime Video. Amazon.com Star Trek: Discovery - Season 4 - Prime Video Star Trek: Discovery subtitles Hungarian S04E01
If you are looking for standalone subtitle files (SRT) for local media players, community translation sites track these releases: The most reliable way to watch the episode