I have not seen any scientific evidence on Papaya, Dragon Fruit etc which supposedly help. All these are myths and hoaxes.
In every pharmacy in India, on the counter you get Papaya extract tablets. It's mainly promoted by the fake scientists on Fakebook.
PS: Lets hope Takeda's vaccine helps. The trials seem promising. Takeda vaccine was tested in 19 clinical trials that included more than 27,000 participants between the ages of 15 months and 60 years, the EMA announcement states. It adds that the trials showed the vaccine prevented “fever, severe disease and hospitalization caused by any of the four serotypes of the dengue virus.”