  Recent experiments have demonstrated the possibility to design highly
controllable junctions on magic angle twisted bilayer graphene, enabling the
test of its superconducting transport properties. We show that the presence of
chiral pairing in such devices manifests in the appearance of an anomalous
Josephson effect ($\phi_0$ behavior) even in the case of symmetric junctions
and without requiring any magnetic materials or fields. Such behavior arises
from the combination of chiral pairing and nontrivial topology of the twisted
bilayer graphene band structure that can effectively break inversion symmetry.
Moreover, we show that the $\phi_0$ effect could be experimentally enhanced and
controlled by electrostatic tuning of the junction transmission properties.
