It is my understanding that for "sane" charger topologies (ie. without tricks that share power components between charger and drivetrain) of the power level req

It is my understanding that for "sane" charger topologies (ie. without tricks that share power components between charger and drivetrain) of the power level required for EV charger the SMPS comes out capable of bidirectional operation somewhat by default because active rectifier and inverter is (topology-wise) the same thing (and the symmetry is quite obvious in typical implementation).