Here is how to get checkbox value from jinja2 template in a flask, first let’s create our jinja2 file:

<form action="" method="post">
        <input type="radio" id="1" name="rating" value="1">
        <label for="1">1</label><br>
        <input type="radio" id="2" name="rating" value="2">
        <label for="2">2</label><br>
        <input type="radio" id="3" name="rating" value="3">
        <label for="3">3</label><br>
        <input type="radio" id="4" name="rating" value="4">
        <label for="4">4</label><br>
        <input type="radio" id="5" name="rating" value="5">
        <label for="5">5</label><br><br>
        
        <p><input type=submit value=Next></p>
</form>

Then lets retrieve value from the form:

if request.method == 'POST':
        print(request.form['rating'])

Where rating is the name of input boxes