Let me let my favorite "prayer author" respond. After quoting from Psalm 2:8 where God calls on His Anointed to "Ask of Me and I will give You the nations for Your inheritance" E. M. Bounds went on to say, "Ask of me is the condition--a praying people willing and obedient. 'And men shall pray for him continually.' Under this universal and simple promise men and women of old laid themselves our for God. They prayed and God answered their prayers, and the cause of God was kept alive in the world by the flame of their praying." God doesn't just mean for His Son to "ask of Me" for the nations, but God calls on us to pray to Him that He would bless His Son with more people to be added to His inheritance!
Yes, you and I can pray for more people to be won to Christ in order for Christ's inheritance to grow to "over-flowing"! I've put Jesus on the TOP of my prayer list! I want Him to be blessed with more and more precious souls won to Him that He will have His mansions FULL with redeemed men, women, young people, and boys and girls from every family, tribe, and nation on earth! A good disciple of Jesus will pray for their Lord to be pleased with a harvest of souls for His glory!