Given $cos\left(\frac{\pi}{4} + \alpha\right) = \frac{\sqrt{2}}{3}$, let's break down the solution step by step:

1. Expanding the cosine of a sum formula: We know that $cos(\theta + \phi) = cos\theta \cdot cos\phi - sin\theta \cdot sin\phi$. Applying this to our given equation, we have:
$$cos\left(\frac{\pi}{4} + \alpha\right) = cos\left(\frac{\pi}{4}\right)cos(\alpha) - sin\left(\frac{\pi}{4}\right)sin(\alpha)$$
Since $cos\left(\frac{\pi}{4}\right) = sin\left(\frac{\pi}{4}\right) = \frac{\sqrt{2}}{2}$, we substitute these values into the equation:
$$\frac{\sqrt{2}}{3} = \frac{\sqrt{2}}{2}cos(\alpha) - \frac{\sqrt{2}}{2}sin(\alpha)$$

2. Simplifying the equation: Multiplying both sides by $\sqrt{2}$ to get rid of the square root gives us:
$$\frac{2}{3} = cos(\alpha) - sin(\alpha)$$

3. **Using the identity for $sin(2\alpha)$**: We know that $sin(2\alpha) = 2sin(\alpha)cos(\alpha)$. To find $sin(2\alpha)$, we need to manipulate our equation. Adding $sin^2(\alpha) + cos^2(\alpha) = 1$ to both sides of our equation, we get:
$$1 + \frac{4}{9} = 1 + 2sin(\alpha)cos(\alpha)$$
$$1 - sin(2\alpha) = \frac{4}{9}$$
$$sin(2\alpha) = \frac{5}{9}$$

4. Finding the denominator: The denominator of our target expression is $1 - sin(\alpha) + cos(\alpha)$. From our earlier step, we know that $cos(\alpha) - sin(\alpha) = \frac{2}{3}$. Adding 1 to both sides, we get:
$$1 + \frac{2}{3} = 1 - sin(\alpha) + cos(\alpha)$$

5. Calculating the final expression: Substituting the values we found into the target expression, we get:
$$\frac{sin(2\alpha)}{1 - sin(\alpha) + cos(\alpha)} = \frac{\frac{5}{9}}{1 + \frac{2}{3}}$$
$$= \frac{\frac{5}{9}}{\frac{5}{3}}$$
$$= \frac{1}{3}$$

Therefore, the answer is: $\boxed{\frac{1}{3}}$.