I don't think so: I shoot only DNG, and have no JPG. Lightroom shows the dimension of a 50 mm crop DNG file to be 3360 x 2240 — if you crop it further in LR, the foregoing dimensions are shown, together with the (smaller) dimensions of the crop made within LR. Am I missing something?
Here are the specs on the Image CaptureImage Resolution:
6000 x 4000 (24.0 MP, 3:2),
4800 x 3200 (15.4 MP, 3:2),
3360 x 2240 (7.5 MP, 3:2),
1920 x 1080 (2.1 MP, 16:9),
4000 x 4000 (16.0 MP, 1:1),
3200 x 3200 (10.2 MP, 1:1),
2240 x 2240 (5.0 MP, 1:1),
1280 x 1280 (1.6 MP, 1:1)