Here we convert all the automatic1111 pngs into jpgs and add the custom metadata

convert.py

import os
from PIL import Image
from PIL import ExifTags
import glob

def convert_png_to_jpg(png_path, jpg_path):
    png_files = glob.glob(os.path.join(png_path, '**/*.png'), recursive=True) #[:1]
    # print(png_files)

    for png_file in png_files:
        relative_path = os.path.relpath(png_file, png_path)
        output_folder = os.path.join(jpg_path, os.path.dirname(relative_path))
        os.makedirs(output_folder, exist_ok=True)

        jpg_file = os.path.join(output_folder, os.path.splitext(os.path.basename(png_file))[0] + '.jpg')

        img = Image.open(png_file)
        img = img.convert('RGB')
  
        parameters = img.info.get("parameters", "")
        exif_ifd = {piexif.ExifIFD.UserComment: parameters.encode()}
        exif_dict = {"0th": {}, "Exif": exif_ifd, "1st": {},
         "thumbnail": None, "GPS": {}}
        exif_dat = piexif.dump(exif_dict)
        
        img.save(jpg_file, format='JPEG', exif=exif_dat)
        
        print(f"Converted: {jpg_file}")
        os.remove(png_file)
        print(f"Removed: {png_file}")

# Set the input and output paths as relative paths
input_folder = '/home/jovyan/stable-diffusion-webui/outputs/txt2img-images/'
output_folder = '/home/jovyan/stable-diffusion-webui/outputs/txt2img-images-jpg/'

convert_png_to_jpg(input_folder, output_folder)