Jackson, who was handed the role for the final three games following the sacking of Scott Parker last month, spoke to BBC Sport with obvious satisfaction at the effort produced despite the club's relegation already having been confirmed.
"Over the last two games they have been positive performances. We knew the challenge that we were coming into tonight. A lot of people probably thought we might give up after what happened with the relegation and accused the boys of not trying, so I am really pleased tonight and the last game as well to show what they are actually capable of."
He was candid about what has prevented the side from putting together enough consistent performances to stay up across the season.
"The capability they have got and showed — that has to be a minimum for them. At this level they can do it. It has been there in spells but it is just the consistency. If you are not winning games that can affect the confidence. It is a young group in terms of experience and they are learning."
Jackson expressed confidence that several members of this squad would return to the top flight.
"I am sure you will see some of that team, some of that group in the Premier League, whether it is this year, next year or years to come, because there is a lot of talent, just not the experience needed."
He also made clear his view on the Kai Havertz challenge that referee Paul Tierney chose to punish with a yellow card.
"In today's game, it is a red card and it is dangerous. He could have injured him as well. That means they go down to ten men with 20 minutes to go and we are still in the game. They're big decisions that sometimes we don't get, and we haven't got throughout the season."
On his own future beyond the remaining game against Southampton, Jackson said he had thought no further ahead than the task immediately in front of him.