First pseudo code of how I might do this. Obviously, this is only 5 minutes of work, so my parser class is not well thought out or might not be neccessary.

1password_lastpass_migrator.rb

# psudeo code for how I might build a 1password => lastpass converter
# this is done becuase lastpasse's importer seems to ingore many fields.

# Usage:
# OnePasswordCsv.new(
#   input_csv_path: 'exported_admin_folder_from_1password.csv',
#   output_csv_path: 'lastpass_admin_import.csv'
#  )

class OnePasswordCsv
  attr_accessor :input_csv_path, :output_csv_path, :csv_rows

  LAST_PASS_HEADERS = [:name, :password, :url, :notes]

  def initialize(input_csv_path:,output_csv_path:)
    self.csv_path = csv_path
  end

  def parse_rows
    self.csv_rows = []
    CSV.foreach(csv_path) do |row|
      csv_rows << OnePasswordObject.new(row_data: row).parse!
    end
  end

  def export_lastpass_csv
  CSV.generate(headers: true) do |csv|
    csv << attributes
    csv_rows.each do |csv_row|
    csv << csv_row.csv_row_output
    end
  end
end

class OnePasswordObject
  attr_accessor :row_data, :object_class, :parser

  ONE_PASSWORD_CATEGORY_MAPPING = {
    '001' => WebPasswordParser,
    '002' => ServerPasswordParser,
    '003' => WifiPasswordParser,
    '004' => WebPasswordParser, #might convert one category to many
    '005' => WebPasswordParser,
    '006' => SomeOtherOtherFormat,
  }

  def initialize(row_data:)
    self.row_data = row_data
  end

  def parse!
    identify_object_class
    self.parser = identify_object_class.new(row_data)
    parser.process
    #parse into the right fields
  end

  def identify_object_class
    one_password_category = row_data[categroy]
    self.object_class = ONE_PASSWORD_CATEGORY_MAPPING[one_password_category]
  end

  def csv_row_output
    parser.output
  end
end


class WebPasswordParser
  attr_accessor :row_data
  def initialize(row_data)
    self.row_data = row_data
  end
  def process
    #map the right fields to the right place
  end
  def output
    #whatever would be the csv row
  end
end