Are rubber grommets OK for junction box?

I'm looking at options for lighting my basement workshop. I really like these "canless" ones that would mount in the suspended ceiling. Interestingly, some come with junction boxes, but MANY do not–they just have the driver. I have no problem putting the driver in a junction box, but I need to seal the opening where the low voltage DC wire comes out (and goes to the light). For low voltage electronics, I would use a rubber grommet for this (with a slit in it because of the connector on the wire). Is this material OK (code compliant)? If not, what do you use?

To be clear, I'm asking about the material, not the clamping capabilities of the grommet. If you think the low voltage wire needs clamping, we can discuss, but that wire is already attached/clamped to the driver box.

Here's a pic of one of these lights: