How can I import VSTO project resources into my Add-ins project developed with Office.js?

Question

I currently have a solution developed with VSTO.
In the newly introduced project, we are developing with Office.js.

Each project is a different solution, but they want to interact with each other.
The operation method of the function to be implemented is as follows.

 1. Get the unique ID assigned to Office through the VSTO project.
        In this case, the unique ID was given to the Office document itself by the VSTO project.
 2. It is used in Add-in Project using Office.js through the received ID.
 3. Success

If I can succeed in this process, my project using Office.js can be successful.

If you have any documentation or workarounds for this, please let me know.
Or tell me if there is currently no workaround for this.

thank you.