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No and no.
You can hack it by having your help file in epub format and inserting the position you want as the last read bookmark into calibre_bookmarks.txt into the epub before opening the viewer. Though since the bookmarks are in CFI format, generating them wont be easy. The easiest way would probably be to save the bookmarks manually using the bookmark facility in the viewer and then manipulate the calibre_bookmarks.txt programmatically.
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