Are the two main characters in the movie inspired by any particular singer’s personal life or biographies?

So far I can NOT find a specific influence to Lana Del Rey or Chad Kroeger, but the following is what the film is inspired by...

The film is the fourth remake after the original 1937 film of the same name. Others include 1954 musical, 1976 Rock Film, and 2013 Bollywood Film.

Background of the Original 1937 Film:

Some film historians believe that the marriage of Barbara Stanwyck and Frank Fay was the film's real-life inspiration. John Bowers has also been identified as inspiration for the Norman Maine character and the dramatic suicide-by-drowning scene near the end of the film (Bowers drowned in November 1936). The film contains several inside jokes, including Gaynor's brief imitations of Greta Garbo, Katharine Hepburn, and Mae West; the "Crawford Smear", referring to Joan Crawford's lipstick; and the revelation that the glamorous Norman Maine's real last name is Hinkle. (Hinkle was the real last name of silent film star Agnes Ayres, and not far removed from Fredric March's real last name, Bickel.)

This film also has many similarities to the earlier film What Price Hollywood? (1932), released by RKO Radio Pictures. The 1932 film's original title was The Truth About Hollywood based on a story by Adela Rogers St. Johns. St. Johns loosely based her plot on the experiences of actress Colleen Moore and her husband, alcoholic producer John McCormick (1893–1961), and the life and death of director Tom Forman, who committed suicide following a nervous breakdown.

However, there are NEW inspirations in the 2018 remake's script, including Kurt Cobain:

In January 2011, it was announced that Clint Eastwood was in talks to direct Beyoncé in a third American remake of the 1937 film A Star Is Born; however, the project was delayed due to Beyoncé's pregnancy. In April 2012, writer Will Fetters told Collider that the script was inspired by Kurt Cobain. Talks with Christian Bale, Leonardo DiCaprio, Tom Cruise, Johnny Depp, and Will Smith to play the male lead failed to come to fruition. On October 9, 2012, Beyoncé left the project, and it was reported that Bradley Cooper was in talks to star. Eastwood was interested in Esperanza Spalding to play the female lead.

And there are several Easter Eggs pointing to other inspriations, including homage to Judy Garland 1954 film, Lady Gaga's early career, Lady Gaga's nose, Bradley Cooper's real life dog, Cooper's character's back story inspired by Bruce Springsteen's autobiography, Bradley Cooper also shadowed Pearl Jam's front man Eddie Vedder, and more!