<c-vars/> doesn't support django template evaluation

[kanishk619]

<c-vars tooltip="{% if user.pk %}Update{% else %}Add{% endif %} User"/>

Invalid block tag on line 1: 'else', expected 'endvars'. Did you forget to register or load this tag?

{% if user.pk %}
    <c-vars tooltip="Update User"/>
{% else %}
    <c-vars tooltip="Add User"/>
{% endif %}

Multiple c-vars tags found in component template. Only one c-vars tag is allowed per template.

<c-vars
        {% if user.pk %}
            tooltip="Update User"
        {% else %}
            tooltip="Add User"
        {% endif %}
/>

Invalid block tag on line 3: 'else', expected 'endvars'. Did you forget to register or load this tag?

Any specific reason why this isn't allowed?