If you say that Orthodox liturgy came before Protoevangelium of James I won’t argue with you. Thanks for the information.
Very good, because I can assure you it did, since we have older attestation of the liturgies of Antioch, Alexandria and the Church of the East, and the Protoevangelium merely summarizes what the hymns of the Orthodox liturgies explain in greater detail.
Now I should clarify one thing: the current form of the Feast of the Entry of the Theotokos in the Eastern Orthodox Church uses a kind of hymn called a Canon*, which takes three. Eight or nine Biblical canticles and then adds a gloss of them, and this mostly replaced the older form called the Kontakion written by the likes of St. Romanos the Melodist which in turn replaced the older metrical homilies of St. Ephrem the Syrian and others, which replaced older hymns and synaxaria. There remains a vestigial Kontakion for the feast which is older than the Kanon, which is probably eighth century, and these short Kontakia survive and are used for all liturgies along with the Troparion. The long Kontakion also survives in the form of Akathist hymns; there are also devotional canons which kind of compete with the Akathists but will never replace them.
Other ancient liturgies have their own forms; many such as the Coptic and Syriac Rite also have the Canon, albeit the Copts base it on different Odes and the Syriac Orthodox wrote some of their own while also translating some Greek Canons.
However regardless of the form, all the ancient Eastern liturgies record the Entrance of the Theotokos. The Roman Rite picked it up also thanks to Byzantine influence in Southern Italy, albeit relatively late, indeed it was one of the last Orthodox liturgical observances added to the Roman Catholic calendar before the great schism (the ancient Roman Rite before reforms started in the fifth century culminating in Gregorian chant under Pope St. Gregory I, who had served in Constantinople and translated Byzantine chant into Latin, was, unlike the other Latin and Western liturgies such as the Gallican, Mozarabic and Ambrosian, extremely parsimonius and minimalist, and used monotone predominantly until at least the late fourth century, and continued to chant the Low Mass in monotone until the ninth century, when they switched to mostly praying it quietly), and High Church Anglicans also observe it.
The feast day is November 21, so do mark your calendar, those of you who love the Our Lady as much as I, for she points me to her Son, my God.
* These Canon hymns by the way are unrelated to the Roman Canon, which in the East is called an Anaphora, and in the modern vernacular a Eucharistic Prayer - the Roman Canon is one of the oldest anaphorae, but not the oldest one we know of or the oldest attested one still in use (that is either the Antiochene Anaphora of the Apostles used by the Ethiopians, and used in variant forms, as the Anaphora of the Twelve Apostles by the Syriac Orthodox, Syriac Catholics and Maronite Catholics, and the Anaphora of St. John Chrysostom by the Eastern Orthodox, or the Alexandrian Anaphora of St. Mark, also known as St. Cyril by the Copts and Syriacs, used by the Coptic and Alexandrian Greek churches and the Syriac Orthodox, or the East Syriac Hallowing of the Apostles Addai and Mari, used by the Ancient/Assyrian Church of the East, the Chaldean Catholics and the Syro Malabar Catholics. It is probably not the ancient anaphora of Jerusalem, the Anaphora of St. James, given that for some centuries the Hagiopolitan church was defunct until the restoration of the Holy City by St. Helena, the Christian mother of St. Constantine (without her, Jerusalem would have remained a small largely ruined administrative center called Aelia Capitolina, and we would not have found the Holy Sepulchre, the True Cross, or many other things, and the main centers of Christian pilgrimage in the Holy Land would be Bethlehem and Caesarea (the latter became the center of the church in the province of Syria Palestina after the destruction of Jerusalem in 130 AD following the failed Bar Kochba revolt).