Yes you can. First of all you need to prepare your tile geometry. Make sure that it is facing upwards (Z-Up) and you applied all transformations (Object->Apply). Make sure it is NOT solidified, the modifier will take care of that. Check the geometry of the tiles that are already included in the file for comparison.  Then we need to duplicate one of the original roof styles, to create a custom one. This works best if you already prepared your roof geometry and applied one the modifiers. In the modifer tab, duplicate and rename it. Then go to the geometry node editor panel. Here you will see node groups for the tiles, the ridge and the wall that you can simply feed with different parameters. When changing the tile geometry make sure you also change the repetition distances (GRID_INTERSECTIONS) to make it fit.