Rubuta ci gaba don wannan sakin layi - Jokubaitis ya taka leda a Lithuania a 2016 FIBA U16 Turai Championship a Poland. Ya samu maki 10 kuma ya taimaka wa tawagarsa ta lashe lambar azurfa. Jokubaitis shi ne dan wasa mafi ƙanƙanta a gasar cin kofin duniya na FIBA na shekara ta 2017
a Misira, yana da maki 10 da 5.3 yana taimakawa a kowane wasa don ƙungiyar ta shida. A Gasar Zakarun Turai ta FIBA U18 ta 2018 a Latvia, ya sami maki 12.9 da 5.6 a kowane wasa yayin da tawagarsa ta kammala ta biyar. Jokubaitis ya jagoranci Lithuania zuwa matsayi na huɗu a gasar cin kofin duniya ta FIBA Under-19 ta 2019 a Girka, inda ya samu maki 11.3 da kuma taimakawa 5.6 a kowane wasa.