ArcPy to WKT and from WKT

arcpy_to_from_wkt.py

import arcpy

# read California cities features' geometries into a WKT string
arcpy.Multipoint(
    arcpy.Array([
        arcpy.Point(*coords) for coords in [
            r[0] for r in arcpy.da.SearchCursor('cities', 'SHAPE@XY',
                                                "STATE_NAME = 'California'",
                                                arcpy.SpatialReference(3857))
        ]
    ])).WKT

# read California state feature's geometry into a WKT string
[
    r[0] for r in arcpy.da.SearchCursor('states', 'SHAPE@',
                                        "STATE_NAME = 'California'",
                                        arcpy.SpatialReference(3857))
][0].WKT

# loading the Convex Hull polygon from JTS back into ArcMap
wkt_string = 'JTS result WKT'
chull = arcpy.FromWKT(wkt_string, arcpy.SpatialReference(3857))
arcpy.CopyFeatures_management(chull, 'in_memory/chull')