Does the iPad 10th gen support Scribble?

Apple's iPadOS scribble feature is support in the new 10th gen iPad and any iPad that supports iPadOS 15 and greater, that supports an Apple Pencil.

You need an Apple Pencil to be able to use the iPadOS scribble feature.

The new 10th gen iPad supports the original, 1st gen Apple Pencil.

If you decide to order/purchase a 1st gen Apple Pencil, do not forget to order/purchasd the $9 U.S.D. Apple Pencil USB-C to Lightning adapter to charge and Bluetooth pair that 1st gen Apple Pencil.

iPadOS Scribble requires an Apple Pencil. Your iPad10 supports the first generation Apple Pencil.

You can enable Scribble in iPad settings:

Settings > Apple Pencil > Scribble - set to ON

If you mean Scribble by Scribble LLC, a writer's guide to publishing, it is available in the iOS/iPadOS App store and requires only iOS or iPadOS 13