Method to fetch used Bytes in cells using listCells() function

[Temperdox]

Describe your idea (If you have more than one idea, please open the rest in other issues)

Regarding the MeBridge, you can only fetch the total size of cells in bytes, you cannot fetch the bytes that have been used to store items.

Describe alternatives you've considered if any

I am requesting that a method such as listCells[1].usedBytes be implemented to fetch the amount of bytes used per cell to store items. This way we can display on a monitor how much storage is available.

Additional context

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Linked Issues

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