Re-read what you typed in when you are sober.Yes, we know that under ideal conditions the F135 can reach 220 kN. The J-20 and F-35 should be seen as twins when it comes to engines; the J-20 is currently hobbled by a crap engine, while the F-35 is also hobbled by non-mature engines. The US often tends to just negate aerodynamic disadvantages by increasing thrust; see the P-51s and the history of American aviation up until the present day. While the F-35 may be a crap or mediocre dogfighter today, future thrust increases (10% thrust increase from 190kN to 219kN is essentially resting thrust) will make the F-35 more competent and capable in WVR.
F135 cannot sustain 220 kN. It has around 190kN max thrust. (If recent reports are to be believed - neither the engine or the aircraft can sustain even the max thrust of 192 kN.)
"US often tends to negate...thrust"
No. US actually is well balanced when it comes to thrust and aerodynamics. F-35 is a single engine fighter that was never intended to be an air superiority fighter. It isn't bad in what it does. The problem is that it tries to accomplish a lot.
"J-20 is currently hobbled by a crap engine"
No. It isn't. AL-31 series powers a lot many aircrafts (flankers) across the planet. It is a great engine that does what it says on the lid. J-20 however requires an even more powerful engine to realize it's full potential as a fifth gen fighter. The Chinese have tested a 155 kN WS-10 engine too on the J-20. Seems like there are plan-A,B and even C.
"10% increase from 190 to 219"
10 percent increase means 0.1*190 + 190 = 209.
So it is around 210 Kn . But it is still 10 kN less than 220 kN.