¿Is Momonga's theme out there? (Chiikawa Soundtrack)

¡Hello! I have been looking for the music that plays whenever Momonga is on scene, but much like the rest of the series' music, I have been unable to find it. I want to believe someone did enough research and is more competent than me to find it. I would be very grateful if someone knows anything about it; Momonga's theme really scratches my brain I can't even describe how much I yearn for it