Jinja2 concatenate string to get values to input

I'm trying to read a dict to put values in a jinja2 template:

 answers = {'obs_18': None, 'obs_1': 'jack', 'rot3': None, 'obs_4': None, 'rot10': None, 'obs_8': None, 'rot7': None, 'rot6': None, 'rot13': None, 'rot21': None, 'obs_13': None, 'rot9': None, 'rot20': None, 'rot11': None, 'obs_7': None, 'rot17': None, 'obs_9': None, 'obs_21': None, 'obs_11': None, 'rot12': None, 'obs_19': None, 'obs_20': None, 'rot16': None, 'rot1': None, 'obs_10': None, 'rot15': None, 'rot18': None, '_id': ObjectId('5ad4b9a7f1ccd84582282207'), 'obs_16': None, 'obs_15': None, 'rot22': None, 'rot19': None, 'rot4': None, 'obs_5': None, 'rot5': None, 'obs_6': None, 'rot8': None, 'obs_12': None, 'obs_14': None, 'rot14': None, 'obs_17': None, 'rot2': None, 'obs_2': None, 'obs_22': None, 'obs_3': None}

using loop.index to populate a form with default values for input fields as strings, but the values shown are just as strings, like:

answers['obs_1']

, instead of the correct value 'jack'.

i'm using this:

<input id="obs_{{ loop.index}}" name="obs_{{ loop.index }}" cols="30" rows="2" value="answers['obs_{{ loop.index }}']"></input>

The values are displayed if i use:

{{ answers }}

Any clues?

Passing args:

@app.route('/checklist/<string:_id>', methods=['GET','POST'])
def checklist(_id):
    form = CheckList()
    perguntas = mongo.db.perguntas.find()
    n_perguntas = mongo.db.perguntas.count()
    print(n_perguntas)
    perguntas.sort([('id',1)])
    answers = mongo.db.checklists.find_one_or_404({'_id':ObjectId(_id)})
    if request.method == 'POST':
        for k in range(1,n_perguntas+1):
            st = str(k)
            answers.append({"rot"+st: request.form.get('rot'+st), "obs_"+st: request.form.get('obs_'+st)})
        print(answers)
    return render_template('checklist.html', form=form, perguntas=perguntas, answers=answers, logeduser=session['username'])

template:

{% extends 'layout.html' %} 
{% block content %}
<div class="col-md-12">
    <h2 style="margin-top: 50px;"><i class="far fa-check-circle"></i> Check-list 912 {{ answers['_id']}} </h2>
    <!-- <form action="/checklist" method="POST">
        <div class="form-group">
            {{ form.f1.label }} {{ form.f1(class="form-control form-control-md") }}

        </div>
    </form> -->
    <form action="/checklist/{{ answers['_id']}}" role='form' method="POST">
        <table class="table">
            <tr>
                <th>N.O.</th>
                <th>Pergunta</th>
                <th>Dispositivo</th>
                <th>Resultado</th>
                <th>Observação</th>
            </tr>
            {% for p in perguntas %}
            <tr>
                <td> {{ loop.index }} </td>
                <td> {{ p.pergunta }} </td>
                <td> {{ p.dispo }} </td>
                <td>
                    <div class="radio">
                        <input name="rot{{loop.index}}" type="radio" value="1">Sim</input>
                        <br>
                        <input name="rot{{loop.index}}" type="radio" value="2">Não</input>
                        <br>
                        <input name="rot{{loop.index}}" type="radio" value="3">S/I</input>
                    </div>
                </td>
                <td>
                    <input id="obs_{{ loop.index}}" name="obs_{{ loop.index }}" value="answers['obs_{{ loop.index }}']"></input>
                </td>
            </tr>
            {% endfor%}
        </table>
        <input class="btn btn-primary" type="submit" value="Enviar">
    </form>
   {{ answers }}
</div>

{% endblock %}