The Independent: maintaining independence is important in relationships.
The Telegraph: Protein intake is also very important in building muscle.
BBC: Meals are also important for building business relationships.
The Guardian: Personalised content is increasingly important for building brand relationships.
The Guardian: She says the course is especially important for building the confidence of teenagers who lack support at home.
I think there is a difference in meaning between "important in" and "important for", but I don't know what it is.