It's a relative open question, but to summarize and suggest topics to start, these kind of policies could set some norms and standards to establish frameworks or guidelines wich support democratic elections within their member states, as so, provide technical assistance and capacity-building programs that strengthen electoral systems, in place to prevent and resolve electoral conflicts. Your question have to account that there is a multifaceted answer.
Article for example: El fortalecimiento de la democracia en Brasil y los retos de la observación electoral (https://revistas.usal.es/cuatro/index.php/1130-2887/article/view/alh20157091108)