EMAymniam (sm3_Final) (S4E27) (Attack on Titan: The Final Season)
The EMAymniam (sm3_Final) is by Hiroyuki Sawano. It's very similar to ymniam-orch (sm2_Final#2) and ymniam-MKorch (sm1_Final#2) precisely thanks to this portion that you hear in this video. This version is from episode 86 of Attack on Titan (approx 3:26 of the original track)
This same portion, but with a different bpm, is played in episode 10 of Part 1 of The Final Season (train & sunset scene and all). I used bits of the S4E10 version for this audio edit, because they are identical. The speed of the result was adjusted to match the audio of this post-ending scene.