Vielen Dank. Damit habe ich es hinbekommen.
{%- if product.properties -%}
{%- for group in product.sortedProperties -%}
{%- if group.translated.name == "Farbe" -%}
{%- apply spaceless -%}
{%- for option in group.options -%}
{%- set i = ( i | default(0) ) + 1 -%}
{%- if i > 1 -%}, {%- endif -%}
{{ option.translated.name|e }}
{%- endfor -%}
{%- endapply -%}
{%- endif -%}
{%- endfor -%}
{%- endif -%}