Storage space on Bangle.js 2.

Hi,
The Bangle.js 2 feature page notes :

256kB RAM 1024kB on-chip flash, 8MB external flash

I'm confused about Espruino's various getFree() outputs :

>process.version
="2v10.89"
>process.memory()
={ free: 7172, usage: 4828, total: 12000, history: 34,
  gc: 0, gctime: 20.99609375, blocksize: 15, stackEndAddress: 537085312, flash_start: 0,
  flash_binary_end: 523848, flash_code_start: 1610612736, flash_length: 1048576 }

'flash_length' would then be the size of the internal flash ?

And then there is :

>require("Flash").getFree()
=[
  { addr: 524288, length: 483328 }
 ]
>require("Storage").getFree()
=8277864
> 

After reading

Flash Library
This module allows you to read and write the nonvolatile flash memory of your device.
Also see the Storage library, which provides a safer file-like interface to nonvolatile storage.

I thought the 'Flash' and 'Storage' modules accessed the same Flash memory, with a separate API (roughly page vs file). But how then is the getFree() output to be interpreted ? Do I actually have 8 MByte available for access through the 'Storage' module ?

What then is the length of 483328 for the 'Flash' module ?

(I have about 60 kByte of code and files on the Bangle.js 2 for the moment, so I don't think it has anything to do with the Flash not being consecutive anymore.)

(All these questions because I need 'a lot' of space for storing a Far-East unicode font...)