It almost definitely cannot. It already has a far lower thrust-to-weight ratio than real launch escape systems (1.x at best versus 6-10+)[1][2], and it would only be able to light its three sea-level engines since the vacuum-optimized engines would be unstable and likely rip themselves apart at 1 ATM.*

*correction: Vac raptors can run at sea level in a test stand. Still doubtful that its safe/reliable and in either case it would still be far too slow.

[1] Note that the first G of acceleration is combating gravity, so Starship at e.g. 1.25Gs would accelerate away from the explosion at 1/20th the rate of Dragon v2.

[2]https://space.stackexchange.com/questions/9067/how-do-the-g-...