Yes, you can even use individual bolts with standoffs to separate motor driven sprockets laterally. Three bolting points (a minimum) determine a plane, but 5 or more bolting points will give added torsional stiffness to the hub. I use class 12.9 high strength bolts for the bolts going through the spacers as they can be tightened somewhat more than generic bike bolts.
It looks like you are using a one-piece spacer which is likely better than a group of standoffs but it can be more difficult to fabricate.
The above sprocket is spaced by both a concentric spacer ( 2.25” exhaust pipe) and 5 bolt through standoffs. I just used generic bolts here as they and the concentric spacer make for redundancy of torsional rigidity.
It’s hard to see what’s in ur pic and maybe it’s not a jackshaft, but if it is a jackshaft, isn’t it rough on the bearings to have the chainring so distant from the bearing and not have the chainrings over the bearing? I can use the 4mm spacers or machine the carrier for the rear sprocket and straighten the chainline that way if worth it but more expensive/work.
“ isn’t it rough on the bearings to have the chainring so distant from the bearing and not have the chainrings over the bearing? ”
Some dual bearing forms are designed to handle eccentric loadings. They each have a “V” shaped race.
Note that this cantilevered sprocket is stiffened and supported by both bolted standoffs and a short piece of round exhaust pipe centered and acting as another spacer. This redundancy of spacers gives the projected forms additional torsional rigidity.
The chainring on the sprocket & mount are subject only to human pedal forces since the motor has a separate chain drive.