hehe/user/plugins/admin/themes/grav/templates/partials/theme.html.twig

{% set theme = admin.themes[admin.route] %}
{% set blueprints = theme.blueprints() %}

<h1>
    {{ blueprints.get('name')|e }}
    <small>{{ blueprints.get('version') ? 'v' ~ blueprints.get('version')|e }}</small>
</h1>

{% include 'partials/messages.html.twig' %}

<p>{{ blueprints.get('description') }}</p>

{% include 'partials/blueprints.html.twig' with { data: theme } %}