Have to to do this sample code then create the product template :

mto_ids = product_routes.search(['|', ('name', '=', 'Make To Order'), ('name', '=', 'Buy')])
route = []
for d in mto_ids:
    route.append(d.id)
                            
tmpl_id = product_tempalte.create({'valuation':'manual_periodic', 'name':champ[3], 'standard_price':champ[5], 'description':champ[3],
        'route_ids':[(6, 0, route)], 'type':'product'})