If you have ascending and descending interferograms, then you can calculate two components of the ground displacement. The LOS directions of ascending and descending Sentinel-1 orbits make it possible to estimate the East component and a mixture of the Up component and the North component.
You will need to do the phase unwrapping and conversion to displacement first. I don’t think there is any function in SNAP to do the complete calculation of the components, but you can get an approximate calculation with the raster calculator. The approximate value of the East component is proportional to result of taking the difference of the Descending-Ascending displacements. The sum of the Descending and Ascending displacements will be proportional to the vertical component plus about 10% of the north component. Doing the simple addition and subtraction operations can give you a qualitative look at two components.