'Continuously send data during Python For Loop when condition met in Flask

I can't seem to send a request containing text during video feed capture loop using OpenCv to the web app in order to show this text in a container.

While the video feed is displayed on the web app, during this loop, once a certain condition is met, I want to send a request containing text where this text will be displayed in the web app under the video feed and will frequently when condition is met as seen below.


def show_feed():
    cap = cv2.VideoCapture(0)
    frame_list = []
    rand_val = random.randrange(1, 20) # Random value
    while True:
        _, frame = cap.read()
        frame_list.append(frame)
        if len(frame_list) == rand_val:
            send_text = f"Frame {str(rand_val)}/{str(len(frame_list))" # "Frame 2/20"

            ### HERE ###
            ### send request to web app containg this text to web app displaying in text box
            ### HERE ###
            time.sleep(5)
            frame_list = []
        yield(b'--frame\r\n'
            b'Content-Type: image/jpeg\r\n\r\n' + frame.tobytes() + b'\r\n')

@app.route('/video_feed')
def index():
    return render_template('index.html')

@app.route('/video_feed')
def video_feed():
    return Response(show_feed(),
    mimetype='multipart/x-mixed-replace; boundary=frame')

Where the html is as follows:

<!-- html stuff-->

<body>
    <div class="video">
         <img src="{{ url_for('video_feed') }}"/>
    <div class="container">
        <input type="text" id="textbox"/> <!-- display text here met output frame from python For Loop ->>
</body>

<!-- html stuff-->

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'Continuously send data during Python For Loop when condition met in Flask

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