According to ESPN, Jackson will join Bayern on loan. According to the agreement reached between Bayern and Chelsea, Jackson's loan fee this season is 13 million pounds. If Bayern buys out the player next summer, the buyout fee will be 56.25 million pounds (and Chelsea will still have Jackson's 25% second-transfer share).
Jackson's contract with Chelsea was originally expired in 2033. He made 37 appearances for Chelsea in 24-25, with 13 goals and 6 assists.