Splitting view rows in upcoming and recent on a date without creating a viewspluging

views-view-unformatted.tpl.twig

{% for index,rawdata in view.result %}
    {% set row_date = rawdata.field_field_conference_date[0]['raw']['value'] %}
    {% set upcoming = false %}
    {% set recent = false %}
    {% if date(row_date) > date() %}
        {% if not upcoming %}
            <small>{{ 'Upcoming'|t }}</small>
            {% set upcoming = true %}
        {% endif %}
    {% else %}
        {% if not recent %}
            <small>{{ 'Recent'|t }}</small>
            {% set recent = true %}
        {% endif %}
    {% endif %}
    {{ rows[index] }}
{% endfor %}