Yes, there are no mega-watt class electrical power sources on a CRJ, lol.
The engines themselves would have a power output in the MW range (if you convert thrust to MW).
H2 has some appealing attributes for use in green aircraft.
The problems are the production, storage, and handling. H2 is either an highly explosive pressurized gas, or a highly explosive cryogenic liquid. It is also much less dense than Jet A
On the ground that would require all-new infrastructure. Since H2 is produced from water and electricity it's inherent "greenness" is dependent on the source of the grid power used to make it. You might be able to produce it onsite at the airport, if you had enough space available.
On the plane, you'd need a clean-sheet design to accommodate enough fuel tanks to hold larger quantities of the less-dense H2. H2 is lighter than Jet A (higher specific energy), but that would probably be offset by the weight of larger tanks, the weight of structure to hold the larger tanks, and the associated form drag of said structure. Might be able to mitigate that with a radical fuselage design, like a flying wing (which has it's own logistics issues).