vim command to include a file into current file

Hi all,
Is there any command or any method that allows to include a file in the current file you are editing?

By including a file I don't mean to read it with :read and paste it. I mean something like
\include{file}

The semantic that I am looking can be (merely an example):
In normal mode, if some include is expanded, it deletes it contents and
replaces the \include statement

In insert mode, when the cursor is hover the line the include is written, vim
reads the file, and copy its content to the line the statement was.

Basically, I would like to have a conceal behaviour for such an order that loads a file as is in that moment so changes in the file included are reflected in the file that includes it.

Thanks in advance,

Regards,
Javier.

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