Allah says in the Qu'ran:
“When you (O Messenger Muhammad) are among them, and lead them in As‑Salaah (the prayer), let one party of them stand up [in Salaah (prayer)] with you taking their arms with them; when they finish their prostrations, let them take their positions in the rear and let the other party come up which have not yet prayed, and let them pray with you”
In al-Saheehayn (the following version was narrated by al-Bukhaari) it is narrated from Abu Hurayrah that the Messenger of Allaah (peace and blessings of Allaah be upon him) said:
“By the One in Whose hand is my soul, I had thought of ordering that wood be gathered, then I would command the call to prayer to be given, and I would appoint a man to lead the people in prayer, then I would go to men [who do not attend the congregational prayer] and burn their houses down around them. By the One in Whose hand is my soul, if anyone of you had known that he would receive a bone covered with meat or two (small) pieces of meat in a sheep’s foot, he would come for 'Isha' prayer.”
This hadith and the Quranic verse state the Fard prayer should be prayed in congregation.
When we go to pray salah at a mosque, we pray the Sunnah prayer first and then we wait for the Imam to lead us in jamaat of the Fard prayer.
Is there any reason why we don't pray the Sunnah rakaats of prayer in jammat(congregation) like we pray the Fard rakaats in jammat(congregation)?