[Python] quarto dashboard shiny package not found

I have a quarto dashboard that makes use of shiny. The test.qmd file starts like this:

---
title: "Test"
format: dashboard
server: shiny
---

...


When running quarto preview function within VS Code (i.e. using the shortcut CTRL+SHIFT+K), the shiny server starts up as expected.

However, when I run the quarto preview command from within an external terminal (with my venv activated), I get an error:

$ quarto preview test.qmd

Starting python3 kernel...Done

Executing 'test.quarto_ipynb'
Cell 1/2: ''...Done
Cell 2/2: ''...Done

pandoc
to: html
output-file: test.html
template: >-
C:\Users\XXXXXX\AppData\Local\Programs\Quarto\share\formats\dashboard\template.html
standalone: true
section-divs: true
html-math-method: mathjax
wrap: none
default-image-extension: png
variables: {}

metadata
document-css: false
link-citations: true
date-format: long
lang: en
page-layout: custom
title: Test
server:
type: shiny
remove-hidden: all

Output created: Test.html

Watching files for changes
ERROR: The shiny package is required for documents with server: shiny

Install the latest version of shiny with pip install --upgrade shiny


I confirm that shiny v.1.4.0 is already installed in my venv.

It seems as if quarto is not really using my activated venv.

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