Getting precipitation daily sum data from GSMap in Google Earth Engine

There are two posts about this issue, but neither seems to work properly:

• Reduce image collection to get daily sum from hourly precipitation GSMaP 12:00h pm to 11:00h am
• Reducing image collection to get daily sum from hourly precipitation and extraction of polygon data?

I want to get the precipitation plot (mean of a polygon) between a couple of months. By using GSMaP i can get the plot easily for a period of given time.

var lluvia = ee.ImageCollection('JAXA/GPM_L3/GSMaP/v6/operational')
.filterDate('2020-01-01','2020-11-30').select('hourlyPrecipRate')
.map(function(im){return im.clip(geometry);})
print(lluvia.size());
print(ui.Chart.image.doySeries(lluvia, geometry, ee.Reducer.sum(),1000));

The problem is if i want to sum the "hourlyPrecipRate" data for each day in that period. I saw many post about this issue.

Is it easier if I want the data weekly in stead of daily?