Plotly Express Scatter With Dashed Trend Lines

I’m trying to replicate this graph in Plotly Express:


So far I have this:

px.scatter(agg_merge, x='Weeks From Go-Live', y='Inc_Count', color='Region', trendline='ols', labels={'Inc_Count': 'Hypercare Entries'}, height=300, width=500) \
        .update_traces(mode='lines+markers') \
        .update_layout(margin=dict(l=0, r=0, b=0, t=0))

I’d like to update the two scatter traces to ‘lines+markers’ mode, but also make the trendlines dashed. I’m assuming I use some sort of selector here, but I’m not sure how.