  We report the transport properties of ${\alpha}$-RuCl$_3$/bilayer graphene
heterostructures, where carrier doping is induced by a work function
difference, resulting in distinct electron and hole populations in
${\alpha}$-RuCl3 and bilayer graphene, respectively. Through a comprehensive
analysis of multi-channel transport signatures, including Hall measurements and
quantum oscillation, we unveil significant band modifications within the
system. In particular, we observe the emergence of spin and valley polarized
multiple hole-type Fermi pockets, originating from the spin-selective band
hybridization between ${\alpha}$-RuCl$_3$ and bilayer graphene, breaking the
spin degree of freedom. Unlike ${\alpha}$-RuCl$_3$ /monolayer graphene system,
the presence of different hybridization strengths between ${\alpha}$-RuCl$_3$
and the top and bottom graphene layers leads to an asymmetric behavior of the
two layers, confirmed by effective mass experiments, resulting in the
manifestation of valley-polarized Fermi pockets. These compelling findings
establish ${\alpha}$-RuCl$_3$ proximitized to bilayer graphene as an
outstanding platform for engineering its unique low-energy band structure.
