NX how to use an interface library in frontend and backend

I'm trying to migrate our repository to a mono repository managed by nx. The frontend is written in angular and the backend uses nodejs / express.
In the beginning, I want to use the same interfaces in both.

For that, I created a new workspace (Integrated Monorepo, not sure if this is the best choice):

npx create-nx-workspace

In the new workspace, I added a frontend and backend app:

npm install @nx/angular 
nx g @nx/angular:app frontend 
npm install @nx/express 
nx g @nx/express:app backend 

I understand, that libraries are used for reusable code in nx. So my idea was to generate a library for interfaces.

npm install @nx/workspace
nx generate @nx/workspace:library lib-interfaces 

Unfortunately, I get the following error:

> Error: Unable to resolve @nx/workspace:library.
>
> Cannot find generator 'library' in
>
> .../workspace/node_modules/@nx/workspace/generators.json.

For that, I didn't find any reason or solution, but I figured out, that I can use @nx/angular for that:

nx generate @nx/angular:library lib-interfaces 

So my Questions are:

1. Is this library useable by express (because it is generated by @nx/angular)?
2. How I can use the library in angular and express?

You can generate a library for interfaces in an Nx workspace using the following command:

npx nx generate @nrwl/js:library lib-interfaces

It will ask you about the testing library you want to use and how you want to build it. Usually jest and tsc is what you need.

You can also run the command with the flat --dry-run to test the output without affecting your repository.

When you create a library, the root tsconfig.base.json file is updated, particularly the path object inside the compilerOptions key.

You will find a new line like the following:

{
  "compilerOptions": {
    "@organization-name/api-interfaces": ["libs/api-interfaces/src/index.ts"]
    }
}

So you can use it like the following:

import {Whatever} from '@organization-name/api-interfaces';