how to use flask render_template API to return multiple images for a HTML template in the template folder?

@app.route('/')
def hello_world():
    #filenames = os.listdir('static')
    filenames = ['1.jpg', '2.jpg'] 

    return render_template('index.html', filenames=filenames)

{% for name in filenames %}
  
{% endfor %}

@app.route('/')
def hello_world():
    #filenames = os.listdir('D:\\1111')
    #filenames = [os.path.join('D:\\1111', name) for name in filenames]
    filenames = ['D:\\1111\\1.jpg', 'D:\\1111\\2.jpg']

    images = []

    for img_path in filenames:
        img_stream = return_img_stream(img_path)
        images.append(img_stream)

    return render_template('index.html', images=images)

{% for img in images %}
  
{% endfor %}

@app.route('/')
def hello_world():
    #filenames = os.listdir('D:\\1111')
    #filenames = [os.path.join('D:\\1111', name) for name in filenames]
    filenames = ['D:\\1111\\1.jpg', 'D:\\1111\\2.jpg']

    images = []

    for img_path in filenames:
        img_stream = return_img_stream(img_path)
        images.append( [img_stream, img_path ])

    return render_template('index.html', images=images)

{% for img, txt in images %}
  filename: {{ txt }}

  
{% endfor %}

{% for img, txt in images %}
  

     filename: {{ txt }}
     
  

{% endfor %}