Can an app block in our application be used only once?

Shopify Apps
1

In our application, we use App blocks. Is it possible for our block to be used only once?

I found the “limit” parameter in the theme schema, but unfortunately, it doesn’t work for App blocks:

“Cause: [blocks/test.liquid] Invalid tag ‘schema’: unknown key ‘limit’.”

2

Same error Invalid tag ‘schema’: unknown key ‘limit’."

{% schema %}
{
“name”: “section_name”,
“limit”: 1,
“target”: “section”,
“settings”: ,
“enabled_on”:{
“templates”: [“product”]
}
}
{% endschema %}
did you solve this ? thanks