Here are a few options, depending on the tone you want:
Direct and clear:
Alexander Isak buades ut av Newcastle-fansen i sin första återkomst till St James’ Park
More journalistic/flowing (common in Swedish sports headlines):
Alexander Isak möttes av burop från Newcastle-fansen i återkomsten till St James’ Park
Both work well. The first is a straight translation, the second uses the more idiomatic Swedish phrasing ”möttes av burop” (was met with boos), which sounds very natural for a sports article headline.
