Cika wannan jumla: Jokubaitis ya taka leda a Lithuania a gasar zakarun Turai ta FIBA U16 a Poland a shekarar 2016. Ya samu maki 10 kuma ya taimaka wa tawagarsa ta lashe lambar azurfa. Jokubaitis shi ne ɗan wasa mafi ƙanƙanta a gasar cin kofin duniya ta FIBA ta 2017 a Masar, yana da matsakaicin maki 10 da taimako 5.3 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
2019 FIBA Under-19 gasar cin kofin duniya a Girka, inda ya samu maki 11.3 da kuma taimakawa 5.6 a kowane wasa.