DESO library NX building get's stuck + Import not found

Question

I want to implement DESO into my app. The most convenient way is probably the DESO library from their developer hub.

I want to be as precise as possible here. So first I downloaded the deso-protocol npm package. In the readme of this library is stated that it is generated with nx. So I downloaded that too. No big issues. And I should: Run nx build deso-protocol to build the library.(in readme). Than I get an error that there is no workspace, when I want to create one with "npx create-nx-workspace deso-protocol --preset=core" , nx gets stuck in that process.

So I decided to do it without the building(I don't quite now if that is needed, am new to npm) and just do it with the classic js imports. The "import Deso from 'deso-protocol';" from the docs isn't working. Because the module imports have to start with "/" or "./" or sth. similar etc.

So I tried import Deso from './node_modules/deso-protocol/src/index.js';. That's not working. Error:

Uncaught SyntaxError: import not found: default

using import { Deso } from './node_modules/deso-protocol/src/index.js'; doesn't work either because then Deso isn't found. I don't quite now what to do now.

Edit

I use plain JavaScript. deso-protocol uses plain JavaScript too, I hope. There isn't much code yet:

Index.js file:

import Deso from './node_modules/deso-protocol/src/index.js';

test.html file:

<script type="module" src="index.js"></script>

That's it. I use http.server from Python to host the local server.