Naomi Osaka 's loss to Amanda Anisimova at the US Open means fans won't get to see her final custom Labubu plan ... but the designer behind her viral figurines tells TMZ Sports she'd love to still bring the vision to life.

Osaka's tournament run introduced viewers to her new friends like Billie Jean Bling, Andre Swagassi and more ... with the Japanese superstar debuting a new bedazzled monster based off a different tennis legend each round she advanced. Gallery Launch Gallery A-Morir Studio

Kerin Rose Gold -- the mastermind behind the "Lablingblings" -- spoke with us about the popularity her products attracted ... and she admitted she's gotten more buzz over the past few days than the time she got name-dropped by Rihanna in an interview.

While she hasn't spoken with Os

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