Yes, there are quite a few. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Naruto Uchiha and Kushina Uzumaki love' in their search bars, and you'll find various stories exploring different aspects of their relationship, from sweet and innocent crushes to more complex emotional bonds.
One idea could be a time - travel fanfiction. Naruto Uchiha (assuming it's an AU where Naruto has Uchiha heritage) somehow travels back in time and meets Kushina Uzumaki. They could form an unexpected friendship as he tries to protect her from the events that would lead to her death. He could also use his knowledge of the future to change things in the village for the better.
Often, there's a theme of discovery. Maybe Naruto Uchiha discovers something special about Kushina Uzumaki that draws him to her, like her strong will or her unique Uzumaki abilities. And also, redemption can be a theme. If Naruto Uchiha has a troubled past, Kushina's love could be the thing that redeems him. There's also the theme of family, as Kushina is Naruto's mother in the original story, so in these fanfictions, they might create a new family dynamic with their relationship.
Another plot twist might be that Kushina Uzumaki has a secret power that she's been hiding, and Naruto Uchiha is the only one who can help her fully unlock it. However, unlocking this power comes with a great cost that they both have to face together.
One aspect to consider in Naruto and Kushina Uzumaki fanfiction is their relationship. Kushina was Naruto's mother. Fanfictions often explore how their bond could have been different if she had survived. For example, she could have taught Naruto more about the Uzumaki clan's secrets. This would have given Naruto an even greater power boost and a deeper understanding of his heritage.
Kushina Uzumaki is significant in Naruto fanfiction as she represents a link to Naruto's past. Her red hair and strong Uzumaki blood are often explored in fan stories. Writers may use her to introduce new plot elements related to the Uzumaki clan.
I recommend "Naruto: Starting from Tsune-san" and "Naruto no Hinata Yuumo" to you. The protagonists of the two books are Tsune-san and an ordinary person who transmigrated through the Hinata clan. Both of them are teammates with Uchiha and Uzumaki Kushina. I hope you like this fairy's recommendation. Muah ~😗
There's also 'Naruto: The Uzumaki - Uchiha Alliance'. In this fanfic, Naruto forms an alliance between the Uzumaki and Uchiha remnants early on in his journey. It shows how this alliance changes the dynamics of the Naruto universe. There are some really interesting relationships that develop between the characters, and it's a great read for fans who want to see a different take on Naruto's story.
I don't think it's a very common or popular concept. Naruto's story mainly focuses on his own journey and relationships within the context of his time. Mito Uzumaki was Hashirama's wife in the original story. Combining them in a love story in fanfiction is quite a stretch. It might appeal to those who like to break the boundaries of the original story and create unique, if not a bit out - there, love stories.
Kushina Uzumaki was known for her fiery red hair and strong will. She was a Jinchuriki, just like Naruto, which made her both powerful and a target. Her love for her family, especially Naruto, was unwavering. Even though she sacrificed herself early in Naruto's life, her influence on him was profound.