Turbocharging is not necessarely an efficiant instrument to augment performance at high altitude and high speed, altough it appearently worked very well in the RW-2800.
The Jumo-213E at critical altitude developed 200 Kp of exhoust jet thrust.
Thatīs quite a lot when You consider that the Jumo-004D was producing a mere 380 Kp thrust at this altitude when running at 100% load.
This equates to 200kg or 2000N which at a speed of 200m/s(440mph) from Power = force x velocity = 400kW at the shaft.
Factoring in the propellor inefficiencies at high altitudes this equates to the aequivalent of ~500kW or ca. 670 hp more power developed by the engine in the first place.
Second order maybe but still to substantial to be ignored.
As you know, to get a 10% increase in speed requires approximtely a cubed increase in power whereas it requires only a squared increase in thrust! It does not come in with increased cooling requirements, too (which would add drag in return)! So itīs maybe not worth to waste that source of power to drive a turbocharger, thatīs at least the reason why Rolls Royce invested so much in turbocharging. They tried to find a solution to keep the jet exhoust thrust.