Any idea what this is for?

[AlbertaRam]

Found this while correcting for tire size (trying to access the box behind it)

does anyone know what it is?

looked in the manual but couldn’t find any mention of a door under the hood latch (bottom left of the lower panel)

 

[MayhemMOORE]

Manual release cable for the transmission.

 

[MValdez]

It's the "Manual Park Release" (Page 416 of the Owners Manual)