Jones, 28, is a former fourth-round pick by the Steelers in the 2013 NFL Draft. He finished out the final year of his four-year rookie contract and returned to Pittsburgh on a two-year contract last offseason.
However, the Steelers elected to release Jones coming out of the preseason and they trimmed their roster down to 53 players. After working out for a number of team, the Jaguars signed him to a contract last month.
In 2017, Jones appeared in three games for the Steelers and recorded 23 completions on 28 attempts (82.1 percent) for 239 passing yards, one touchdown and one interception.
Robinson, 26, is a former seventh-round pick of the Lions back in 2015. The Lions traded him to the Panthers for a conditional 2020 seventh round pick coming out of the preseason.
Robinson was in the final year of his four-year, $2.338 million contract and set to make a base salary of $705,000 for the 2018 season when the Panthers waived him in September.
In 2018, Robinson has been active for two games.