How to select a geometry of the lasso on the data shaded plot


I have a usecase to plot a billion points in form of a datashaded scatter plot , and on lasso over the plot points, I need to select the geometry of the lasso, or somehow obtain the co-ordinates of it.
I have a pandas dataframe with three columns embed_x, embed_y and pred (this is a categorical value to define the color to the points)
#Below is my code

import numpy as np
import pandas as pd
embed_x= np.random.randn(1000)
embed_y= np.random.randn(1000)
df_from_arr = pd.DataFrame(data=[embed_x, embed_y,pred]).T
df_from_arr.rename(columns = {0:'embed_x',1:'embed_y',2:'pred'}, inplace = True)
xmin = df_from_arr['embed_x'].min()
xmax = df_from_arr['embed_x'].max()
ymin = df_from_arr['embed_y'].min()
ymax = df_from_arr['embed_y'].max()
from holoviews import opts
from holoviews import streams
import holoviews as hv
import holoviews.operation.datashader as hd
import datashader as ds
opts.defaults(opts.Points(tools=['box_select', 'lasso_select']))
# Declare some points
points_data = hv.Points(df_from_arr)
datashaded = hd.datashade(points_data,aggregator=ds.count_cat('pred')).redim.range(x=(xmin,xmax),y=(ymin,ymax))

# Declare points as source of selection stream
lasso = streams.Lasso(source=datashaded)

def lassocallback(geometry):
    print(f"i am called {geometry}" )
    return geometry

# Combine points and DynamicMap
datashaded + hv.DynamicMap(lassocallback, streams=[lasso]).opts(tools=['hover'])

But that does not seem to work, any help will be greatly appreciated.