Can loving kindness, compassion and sympathetic joy be developed through Vipassana meditation?

As far as I understand, Vipassana meditation trains attention and equanimity. Which makes sense because you are basically doing body scans all the time and remaining equanimous to bodily sensations, whether they are pleasant or unpleasant. Cool. But ... how can you develop love, compassion and sympathetic joy by doing that? How can "watching equanimously your bodily sensations" make you a more loving and compassionate person? At best you should become a very neutral, equanimous, cold person with a very high level of awareness, but then how would you cultivate sympathetic joy, loving kindness, compassion? Does one need to complement vipassana with other techniques to develop those qualities?