ExtendScript - Import individual compositions from .aep-Projects

did you find any solution my friend ??

If you don't know in advance which comps from which projects you need to import, shachar carmi's suggestion (import the entire project and delete all unneeded items) is the only option. You need to make sure to not delete precomps that are part of the comp you want to keep. Hence deleting is probably done best using the Reduce Project menu command using app.executeMenuCommand.

So the steps would be

1. save your project
2. open the project you want to import the comp from
3. select the comp you want ot import and Reduce Project
4. save project with a new name
5. open original project from step 1 again
6. import project saved in step 4

Tom's is the easiest approach for a user-based solution, Shachar's is the most straightforward way with the core API.

If you're up for a challenge, you can look into AEPX files, which are basically After Effects files saved as XML. If you had your original files saved as AEPX, you could find the comp you want and generate a new file with just that comp, and then import it. This is undocumented and takes some trial and error. 

you could import the project and then delete all unneeded items.

That's not possible out of the box.

You'd need to save your comps as individual projects first, by using Save Comp as Project https://aescripts.com/save-comp-as-project/ or by converting each composition into an executable JSX code with compCode https://aescripts.com/compcode

Cheers.