The linked reference 59 in the wikipedia article you quote (Koposov et al (2019)) closes with the question
The fact that S5-HVS1 was ejected with a velocity almost twice
that of all other known HVS potentially originating from the GC
poses two questions: were all the known HVS produced by the same
mechanism and has the HVS velocity spectrum been constant in
Thus at that time there seem to be no other known hypervelocity stars leaving the galaxy due to interaction with Sgr A*.
Searching through ADS with the keywords 'hypervelocity', 'milkyway' and 'ejected' gives me a paper from Evans (2022) which tries to come up with a likelyhood of finding these kind of stars. They state
Constraints from Gaia EDR3 and S5-HVS1 become slightly more vertical in κ − η space as we now expect more (fewer) HVSs for κ < −1.3 (κ > −1.3) when compared to a single power-law, but otherwise remain unchanged. For
our fiducial model, this prescription would predict 14.2 +5.8
−5.0 total HVSs in Gaia DR4.
That leaves me to believe that they also don't know any further confirmed HVS accelerated by Sgr A* to velocities greater than the galactic escape velocity - but a careful analysis of Gaia DR4 data might reveal a few candidates.