Cannont compile API Server UI

We have v8.1.4 activated QBM\HtmlDevelopment\Compiler again (after some period of not missing it) and want to compile the API Server UI.

The interresting part from the log

2021-07-20 09:56:23 WebCompiler Starting process npm.cmd, args = run build:debug --scripts-prepend-node-path=true
2021-07-20 09:57:13 WebCompiler The command generated the following console output:

> api-server-web-ui@0.0.0 build:debug C:\Users\*******\AppData\Local\Temp\html\QBM\ApiServerWebUi
> ng build --prod --source-map

Date: 2021-07-20T07:57:13.339Z
Hash: 489a81527b30da1b98fb
Time: 40041ms
chunk {0} runtime.06daa30a2963fa413676.js, (runtime) 1.5 kB [entry] [rendered]
chunk {1} main.9868d9b237c3a48c54da.js, (main) 182 bytes [initial] [rendered]
chunk {2} polyfills.85f47f0bf59079cbc23a.js, (polyfills) 189 bytes [initial] [rendered]
chunk {3} styles.d3420ec8735963bfee2b.css, (styles) 679 kB [initial] [rendered]
chunk {scripts} scripts.b35907f55324a16f88af.js, (scripts) 1.44 MB [rendered]

WARNING in Invalid font values at C:\Users\*******\AppData\Local\Temp\html\QBM\ApiServerWebUi\src\assets\C:\Users\*******\AppData\Local\Temp\html\QBM\ApiServerWebUi\src\assets\styles.less:5568:2. Ignoring.

ERROR in Module build failed (from ./node_modules/sass-loader/lib/loader.js):
Error: Cannot find module 'node-sass'

After that, I copied everything from "C:\Users\*******\AppData\Local\Temp\html" (while compiling) and ran "npm install --scripts-prepend-node-path=true --progress=false" inside ".\QBM\ApiServerWebUi". Not sure if this is the way to do it, but I get more information(that seems to be valid)

gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack at PythonFinder.failNoPython (C:\Users\D0E01149\AppData\Local\Temp\html\QBM\ApiServerWebUi\node_modules\node-gyp\lib\configure.js:484:19)
gyp ERR! stack at PythonFinder.<anonymous> (C:\Users\D0E01149\AppData\Local\Temp\html\QBM\ApiServerWebUi\node_modules\node-gyp\lib\configure.js:509:16)
gyp ERR! stack at callback (C:\Users\D0E01149\AppData\Local\Temp\html\QBM\ApiServerWebUi\node_modules\graceful-fs\polyfills.js:299:20)
gyp ERR! stack at FSReqCallback.oncomplete (fs.js:165:21)
gyp ERR! System Windows_NT 10.0.18363

And yes, indeed, I have no python here - and without python, no node-gyp (node-gyp requires that you have installed a compatible version of Python). I searched for a list of dependencies I have to install prior the compilation process but had no luck finding one.
Could one please point me to the latest documentation? Or is there an (inofficial) list of dependencies?

Beside that, there is a long list of deprecated dependencies while installing...