Convert LineString to Polygon using Python

I am trying to convert geometry from type: LineString into type:Polygon where each line of data is a list of coordinates and at the same time I am trying to add 2 miles radius for each coordinates within list as buffer and output should be polygons. Please see sample data as below:

{

"type": "FeatureCollection",

"name": "Sample_lines",

"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },

"features": [

{ "type": "Feature", "properties": { "OBJECTID": 123, "GLOBAL_ID": "8CAB8A", "IDENT": "41",  "TYPE": "N",  "Shape__Length": 0.2733 }, "geometry": { "type": "LineString", "coordinates": [ [ -112.400011882673994, 41.0833390325461, 0.0 ], [ -112.56667894652, 41.300005042600802, 0.0 ] ] } },

{ "type": "Feature", "properties": { "OBJECTID": 124, "GLOBAL_ID": "9ACAVB", "IDENT": "45",  "TYPE": "N",  "Shape__Length": 0.1573 }, "geometry": { "type": "LineString", "coordinates": [ [ -112.56667894652, 41.300005042600802, 0.0 ], [ -112.650011982188005, 41.4333400501312, 0.0 ] ] } },

{ "type": "Feature", "properties": { "OBJECTID": 125, "GLOBAL_ID": "5ACBFA", "IDENT": "48",  "TYPE": "N",  "Shape__Length": 0.4599 }, "geometry": { "type": "LineString", "coordinates": [ [ -112.650011982188005, 41.4333400501312, 0.0 ], [ -113.100012081374004, 41.5000060205737, 0.0 ] ] } }

]

}

This is what I have tried so far and it is throwing an error as follows:
buffer = gpd.points_from_xy([(x,y)]) TypeError: points_from_xy() missing 1 required positional argument: 'y'.

Please see below code what I attempted to do:

import json
import geopandas as gpd
from shapely.geometry import MultiPolygon

# Load geojson 
with open('Sample_lines.geojson') as f:
    gj = json.load(f)

features = []
for f in gj['features']:

    coords = f['geometry']['coordinates']
    print(coords[0][0])
    print(coords[0][1])
    print(tuple(coords[0]))
    print(coords)
    #quit()
    # Buffer points along line
    buffers = []
    for x,y,z in tuple(coords):
        buffer = gpd.points_from_xy([(x,y)])
        buffer = buffer.to_crs(epsg=4326)
        buffer = buffer.buffer(2)
        buffers.append(buffer)
        
    # Create multipolygon from buffers    
    mpolygon = MultiPolygon(buffers)
    
    # Create feature
    features.append(
        {'geometry': gpd.GeoSeries(mpolygon).__geo_interface__,
         'properties': f['properties']}
    )

# Output new GeoJSON    
new_gj = {
  "type": "FeatureCollection",
  "features": features
}

# output in .GeoJSON

with open('lines2Polygon.geojson','w') as f:
    dump(new_gj, f)

print(new_gj)

Where am I going wrong here? Thank you in Advance for your time and support.

source https://stackoverflow.com/questions/77594571/convert-linestring-to-polygon-using-python