How can I convert X-coord and Y-coord in INP file to standard latitude and longitude？

[CedarSnowy]

I want to draw polygons using mapbox,but I can't convert the coordinates of polygons to standard latitude and longitude.
In Latte_art_double_shot DEMO,the coordinates of nodes and lines were converted to standard latitude and longitude correctly，I want to do the same at the coordinates of polygons,for example:

[Polygons]
;;Subcatchment X-Coord Y-Coord
;;-------------- ------------------ ------------------
1 3936.840 6905.260
1 3494.740 6252.630
1 273.680 6336.840
1 252.630 8526.320
1 463.160 9200.000
1 1157.890 9726.320
1 4000.000 9705.260

[CedarSnowy]

I think I have solved this question,and I use following code:

PATH = "./config/Example1.inp"
crs = "epsg:3728"  # Coordinate Reference System
m = swmmio.Model(PATH, crs=crs)

m.to_crs("EPSG:4326")
res = m.inp.polygons.round(5)
res.info()