@yole I seem to recall trying that, it doesn’t work for me:

val call = ((element.parent as? KtValueArgument)
    ?.parent as? KtValueArgumentList)
               ?.parent as? KtCallExpression ?: return PsiReference.EMPTY_ARRAY

val method = call.reference?.resolve() ?: return PsiReference.EMPTY_ARRAY

resolve()

always returns null.