I found this online, written by R’Moshe Feinstein:
My honorable friend, meḥutan, ha-Rav ha-Gaon, Moreinu ha-Rav Yeḥiel Yitzḥak Perr, shlit”a, Head of Mesivta Derekh Ayson, wishing you well. Regarding the question of the honor of his exalted Torah whether it is proper to add to a Tannaim the following language: “If after the marriage they [the couple] will separate, G-d forbid, the husband will not refrain from giving a get, and the woman will not refuse to accept it, when the specific Beit Din so orders.” By adding this addendum, the secular courts will force the two sides to listen to the Beit Din.Adding this is permitted and the get will not be a ‘forced get.’ It also has the benefit that
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it will save her [the wife] from the chains of agunah.
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It is advisable that he [the rav] meet with the groom and bride and get to know them well to determine whether such a clause might, G-d forbid, based on their nature cause any arguments or feuds be-tween them. His friend, Moshe Feinstein
P.S. The asterisks are mine.