but in difference to the drawing, because of the spiral galaxy dynamics i would rather say matter injection to the black hole is from the compressed room-time direction, where the inter-galactic travel goes...

injected matter (compressed roomtime)- black hole (the roomtime bubble)- jet streams (stretched roomtime)

https://de.wikipedia.org/wiki/Tr%C3%A4gheitsfusion_Lasergetriebene_Proton-Bor-Fusion

that is about how to get direct pure energy from nuclear fusion using the shortcut quantum tunneling effect

https://en.wikipedia.org/wiki/Quantum_tunnelling