enable fill between two lines in y direction only within intersection part

This code snippet will plot two lines:

import plotly.graph_objs as go

anchor_rate = [1000, 1660.89, 3220.62, 5927.36]
anchor_psnr = [31.799098, 34.155477, 36.053423, 36.5]

tested_rate = [752.33,1608.90,3114.10,5685.72]
tested_psnr = [31.336015,33.752160,35.730303,37.200365]

fig = go.Figure()

fig.add_trace(go.Scatter(
    x=anchor_rate,
    y=anchor_psnr,
))

fig.add_trace(go.Scatter(
    x=tested_rate,
    y=tested_psnr,
))

fig.show()

This is the plot:

How to fill between two lines in y direction only within intersection part, like this? And how can fill them with different colors?

In summary, two questions:

1. How to fill between two lines in y direction only within intersection part?
2. And how can fill them with different colors?

Comienza reproduciendo el ejemplo de Python proporcionado con dos trazas go.Scatter y compáralo con el gráfico solicitado que muestra únicamente la intersección. Investiga el comportamiento existente del relleno de Scatter y determina cómo deberían admitirse las dos cuestiones —relleno restringido y colores diferentes—; se considerará terminado cuando ambos resultados solicitados estén demostrados o especificados claramente.