add scatter points to renko plot

@DanielGoldfarb ... thank you for your wonderful work.

Hello can someone help me to add scatter points to my renko chart.
All i am trying to do is add scatter chart to existing chart(ie marker) "o" where volume is > 500 in my data.

sample Data structure - csv file:

time,Open,High,Low,Close,Volume,date
2020-06-16 09:33,2439.0,2439.0,2439.0,2439.0,340.0,2020-06-16 09:33:03.872999936-04:00
2020-06-16 10:25,2450.5,2450.5,2450.5,2450.5,521.0,2020-06-16 10:25:01.012000-04:00
2020-06-16 10:30,2440.0,2440.0,1440.0,2440.0,415.0,2020-06-16 10:30:13.260999936-04:00
2020-06-16 10:30,2429.5,2429.5,2429.5,2429.5,770.0,2020-06-16 10:30:20.295000064-04:00

Basic code:

df = []
df = pd.read_csv('test.csv',index_col=0,parse_dates=True)
df = df.iloc[:20000]
bucket_size = 0.00012 * max(df['Close'])
volprofile  = df['Volume'].groupby(df['Close'].apply(lambda x: bucket_size*round(x/bucket_size,0))).sum()
mc = mpf.make_marketcolors(base_mpf_style='yahoo')
s  = mpf.make_mpf_style(base_mpf_style='nightclouds',marketcolors=mc)
fig, axlist = mpf.plot(df,type='renko',renko_params=dict(brick_size=3),returnfig=True,style=s,tight_layout=True)
vpax = fig.add_axes(axlist[0].get_position())
vpax.set_axis_off()
vpax.set_xlim(right=1.2*max(volprofile.values))
mpf.show()

current sample image:

Start with the mpf.plot(..., type='renko', returnfig=True) call and the returned axlist in the provided example. Read how Renko plots expose their axes and how the supplied Volume values relate to the plotted data. Done means documenting or implementing a way to show marker points for rows whose volume exceeds 500 on the Renko chart.