Apple Pencil/Scribble support is detailed here:
iOS and iPadOS - Feature Availability - Apple
As you’ll note, Scribble is currently available for these languages:
- Cantonese (Traditional)
- Chinese (Simplified)
- Chinese (Traditional)
- English (Australia)
- English (Canada)
- English (India)
- English (Ireland)
- English (New Zealand)
- English (Singapore)
- English (South Africa)
- English (United Kingdom)
- English (United States)
- French (Belgium)
- French (Canada)
- French (France)
- French (Switzerland)
- German (Austria)
- German (Germany)
- German (Switzerland)
- Italian (Italy)
- Italian (Switzerland)
- Japanese
- Korean
- Portuguese (Brazil)
- Portuguese (Portugal)
- Spanish (Chile)
- Spanish (Colombia)
- Spanish (Mexico)
- Spanish (Spain)
- Thai (Thailand)
- Ukrainian
Whether or not Dutch will ever be supported by iPadOS is known only within Apple.
If you would like to request support for Scribble in Dutch, Apple do invite submission of comments and feature requests via its Product Feedback portal. For iPad and iPadOS:
Feedback - iPad - Apple