The attacker, who signed from Villarreal for a modest sum in the summer, has scored 11 goals in all competitions.
However, Jackson has missed many presentable chances in all competitions, including in the 2-2 draw against Brentford at the weekend.
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It's not enough because I have missed a lot," Jackson reflected to club media.
For me, I should have a lot more, but every game I try to make the team win and help my team-mates. My team-mates have helped me as well so every game, even if I don't score, I want to win.
I have missed a lot of chances. I should have more than 11 goals, but for me, it is just the beginning and I'm just starting to feel pleased in England. I keep moving forward."