Flask wtforms 是否可以在wtform flask的下拉菜单中设置复选框？

请有人帮助我在wtforms flask的下拉列表中设置复选框，我需要选择多个复选框并将数据发送到表单。这是我的代码 #WTform

#HTML代码

{{form.hidden_tag（）}}
{{form.csrf_token}
{{form.pname.label}
{{form.pname}
{{form.proname.label}
{{form.proname}


1.
2.
3.
4.
{{form.submit}

class ReporttestForm(FlaskForm):    
    pname        = TextField("Platform Name",validators=[DataRequired()])
    proname      = TextField('Project Name', validators=[DataRequired()])
    collab = SelectField ('Category', choices=[('1', '1'), ('2', '2'), (3', '3'),('4','4')])
    submit      = SubmitField('GENERATE')

<form method="POST" enctype=multipart/form-data action="">
{{ form.hidden_tag() }}
{{ form.csrf_token }}
  
<div>
{{ form.pname.label }}
{{ form.pname}}
{{ form.proname.label}}
{{ form.proname }} <br><br>
<select id="collab" multiple="multiple">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
</select>
{{ form.submit}}
</div>