Hey I am new to Node-Red so forgive me if this question is stupid 
I want to make a Flow, which creates a new Flow from an injected json file at the first one. Is it possible to create a Flow in a Flow without using the "Import"-button at all?
There are no stupid questions. 
First, it should be possible to push new flows using the Admin HTTP API, the same API that is used by the Editor itself.
However, modifying the environment in such a way doesn't come without risks. Are these flows generated from user data outside of your control? In any way, you could end up with a non-functioning runtime and security issues.
And since you are new to Node-RED, I think you should get a grasp of all the basic concepts before doing something such advanced. I have been using Node-RED for many years and many different use-cases, and never had the need for such metaprogramming.
So what is your actual use-case? Could it be solved in other (simpler) ways? I think that should be discussed first, before diving in too deep. 
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At first thanks for the fast answer.
The data generating the flows are under my control and nobody else can change something. So i don't think the problems you mentioned would affect me.
To be honest i'm surprised that it is that difficult. My first step was to find a node in the library
So as you say im starting with some easier stuff.
I'm in a company right now (its a confusing system, im switching between university and work), to find out and write a little bit about Low-Code. With that said my supervisor told me to write a programm, which converts a json file to a flow of any Low-Code platform.
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