I am sorry, I ask about database or bookmark table.
How to add field in bookmark table?
I will add field title and description like this
private static native boolean recItemInsert( long rec, String name, int pageno, String title, String desc );
i know you are using BMDatabase class.
the fields of this table can't be added.
but... i think you can set name as json string, package 2 fields into name.