Some content text with [snippet_shorctode]
Save snippet content to a variable
{% capture snippet_shorctode %}{% include 'snippet_content' %}{% endcapture %}
Save page or anything else content to a variable
{% capture content %}{{ page.content }}{% endcapture %}
Replace content shorcode with snippet content
{% assign content = content | replace: '[feedback_form]', feedback_form %}
Render the content
{{ content }}