How can I find the app ID for my metaobject creator extension?

Shopify Partner
12 0 5

I have an app that creates a metaobject

It appears with the name (type) as example:

app--39503265793--my app
I have an app extension that I want to read that app type "app--39503265793--my app" 
but, I don't know the app ID.  How can I get the app ID, so I can query it?

I will query it in luquid like:
{{ app.metaobjects }}
{% for item in app.values %}
{{ item.cart_page_message }}
{% endfor %}

but I don't know the app ID, because it will be different when installed? (I am in dev mode)

Can someone from Shopify help pls? Thanks
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