Jani, who will share the team's Lola-Toyota B12/60 at Road Atlanta with Nick Heidfeld and Nicolas Prost, said: "It is a good way to go out because we are sure to have a good fight with the Muscle Milk [Pickett Racing] HPD.
Jani, who will test the new Porsche LMP1 hybrid for the first time next week at the German manufacturer's Weissach development facility.
"It would be nice to end with a victory," he said. "Alexandre Pesci [the team owner] brought me into sportscars at a time when I wasn't very keen to do it. He gave me a platform to present my talents, which has allowed me to get the Porsche drive," Jani told AUTOSPORT.
"The team has come a long way since 2009. They benefitted from me, but I definitely benefitted from them. A lot of thanks go to them."