Box annotation

The annotation parameter takes also the box type, in a similar same way the line annotation works, as a comma-separated list:

1. annotation type: box
2. xMin
3. xMax
4. yMin
5. yMax
6. border_color
7. border_width
8. fill_color

[gfchartsreports height="400px" type="line" include="3" x_scale_type=linear annotation="box,4.5,8.5,10,25,orange,4,#fd7b1c99;box,1.5,2.5,0,35,black,1,#4042487a"]