Render Setup Module:

import maya.app.renderSetup.model.override as override
import maya.app.renderSetup.model.selector as selector
import maya.app.renderSetup.model.collection as collection
import maya.app.renderSetup.model.renderLayer as renderLayer
import maya.app.renderSetup.model.renderSetup as renderSetup

Export & Import Render Setup:

import maya.app.renderSetup.model.renderSetup as renderSetup

import json

def importRenderSetup(filename):
    with open(filename, "r") as file:
        renderSetup.instance().decode(json.load(file), renderSetup.DECODE_AND_OVERWRITE, None)

def exportRenderSetup(filename, note = None):
    with open(filename, "w+") as file:
        json.dump(renderSetup.instance().encode(note), fp=file, indent=2, sort_keys=True)

Reference Links:

• https://knowledge.autodesk.com/support/maya/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/Maya-Rendering/files/GUID-FFC3298A-9803-4EAF-B472-D13247319EB0-htm.html
• https://fredrikaverpil.github.io/2017/05/07/querying-render-setup-in-maya-2017/