{% assign f = post.image.feature | split: '.' %}
{% capture feed_feature_image %}
<img src="{{ site.url }}{{ f[0] }}-1024.{{ f[1] }}" alt=""
  srcset="{{ site.url }}{{ f[0] }}-320.{{ f[1] }} 320w, {{ site.url }}{{ f[0] }}-600.{{ f[1] }} 600w, {{ site.url }}{{ f[0] }}-768.{{ f[1] }} 768w, {{ site.url }}{{ f[0] }}-1024.{{ f[1] }} 1024w, {{ site.url }}{{ f[0] }}-1600.{{ f[1] }} 1600w"
  sizes="(max-width: 1200px) 100vw">
{% endcapture %}
{{ feed_feature_image | markdownify | xml_escape }}

{% assign f = post.image.feature | split: '.' %}
{% capture feed_feature_image %}
  <img src="{{ site.url }}{{ f[0] }}-1600.{{ f[1] }}" alt="">
{% endcapture %}
{{ feed_feature_image | markdownify | xml_escape }}

SImplify feed feature image source size
SImplify feed feature image source size
