Is it permissible to add supplications, such as "Our Lord, we ask You for Paradise and seek refuge in You from the Fire," to the Talbiyah?

Scholars have agreed upon the desirability for the pilgrim in a state of ihram to frequently repeat the talbiyah. It is then sunnah for him to invoke blessings upon the Prophet (peace and blessings be upon him) and ask Allah for whatever he desires, such as requesting Paradise and seeking refuge from the Fire, and to supplicate for whatever he loves of the good of this world and the Hereafter.