PreviewField

https://odininspector.com/attributes/preview-field-attribute

[PreviewField]
public Object RegularPreviewField;

[VerticalGroup("row1/left")]
public string A, B, C;

[HideLabel]
[PreviewField(50, ObjectFieldAlignment.Right)]
[HorizontalGroup("row1", 50), VerticalGroup("row1/right")]
public Object D;

[HideLabel]
[PreviewField(50, ObjectFieldAlignment.Left)]
[HorizontalGroup("row2", 50), VerticalGroup("row2/left")]
public Object E;

[VerticalGroup("row2/right"), LabelWidth(-54)]
public string F, G, H;