Plasma or Charged Spazer can reach the shot blocks through the tunnel while crouched.

Requires:

"ScrewAttack"
"Morph"
"Plasma"

Dev note: Plasma is somewhat known as a way to reach the blocks. Charge+Spazer is not, and to shoot around the Bowling Chozo you would add Wave to make things more complicated. If we're requiring strat knowledge here, camera unlock is more generally applicable. A very precise wave shot from the stairs can also work but is much harder and less obvious than the camera unlock strat.