The namespace and the key of fields in the annual accounts

As many (but not all) inputs are stored in “result” tags in the templates you could try to use them. You can call them from other reconciliation templates. You can find more info on how to use the result tags here.

To find out what the result tags on a template are, you can use debug mode and then scroll down the page.
There in the “Named results” list you should be able to find the one you need.

Hope this was helpful to you.