Actually found a solution.
Android Studio does not autocomplete constraintLayout parameters in an include tag but they do have an impact on it as long as you give that include a size.
<include
layout="@layout/tmp_2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/label_2"
/>