関連ワード:  how to insert a key in google sheets    how to add a key in google sheets    how to insert a legend in google sheets    how to add a key in google sheets graph    how to add a legend in google sheets    how to add a color key in google sheets    how to insert a legend in google docs    how to add a key in google docs    how to add a color code key in google sheets    how to add a second legend in google sheets