Embed document content in other documents

Hi,
I have a very common use case that I have to add a standard text block in multiple documents. Anytime something in this standard block changes I have to change every single document.
I would like to have the option to embed other documents or parts of other documents in documents. That I can organise my standard blocks on one central space and if I need to change something I have to change just the original block and don't have to edit every single document. It should not be a link but show the content of the liked document.
Short therm it would be great to embed the content of the whole document, just show the content, on the long term it would be great if you can embed parts of a document in other documents, like defining a container in one document where you can refer to in other documents.
As example in confluence this is the excerpt makro