[sqlite] How to customize "Bytes of unused 'reserved' space at the end of each page" ?

[sanhua.zh]

Now I want to add my customize data for each page.
And I find thatIt describles the"Bytes of unused‘reserved' space at the end of 
each page”. I think it’s the exact thing what I need.
But I have no idea how to use it. It seems that there is no interface to do 
this.
Can any one tell me about the details?
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