It's possible that Bournemouth will win Chelsea because of their consistency in their previous matches. Chelsea's performance is not stable and unpredictable which makes it impossible for you to rely on them. Bournemouth is in their best form and shouldn't be underestimated because they don't have a big name. Chelsea needs to improve their performance if they don't want to be bonus point for Bournemouth.
Chelsea are experiencing a decline in performance lately, where in the previous 4 matches they have not won even once, so it is clear that the match when hosting Bournemouth later will not be an easy match for them and also considering Bournemouth are in a positive phase this season so I think even though Chelsea chances of winning are higher, it does not rule out the possibility of losing again.
Thus the safest bet in their match is BTTS.
Actually, Bournemouth and Chelsea's performances are almost balanced so I think maybe they will get a draw but this match will be held at Chelsea's home ground so I think Chelsea will play as hard as possible in front of their supporters, if I myself am still quite sure Chelsea can still perform well in the EPL their poor performances lately will be used as evaluation material by the coach I predict Chelsea's victory and the worst result is a draw.