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The JWST data will certainly be a useful probe of dark matter! For example there is a lot we can glean from something called strong lensing. This is the effect that when you have a background source of light, such as a faraway galaxy, and in between that object and JWST there is a foreground object, such as a galaxy cluster, the gravitational influence of the foreground object can bend the light from the background object, creating strange distorted arc like shapes that can actually be scene in the first deep field image from JWST.
One way this can be used for dark matter is that we could try and detect small foreground dark matter halos using strong lensing, and we could use this to tell us something about the nature of dark matter.
There's nothing here!