How to add item to array in prisma database at frontend?

model User {
  id            String    @id @default(cuid())
  name          String?
  email         String?   @unique
  emailVerified DateTime?
  image         String?
  accounts      Account[]
  sessions      Session[]
  coins         Coin[]
}

model Coin {
  id     String  @id @default(cuid())
  name   String
  rank   Int?
  User   User?   @relation(fields: [userId], references: [id])
  userId String?
}