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You cannot change that pattern in the settings. The id's are only used for headers in the TOC (ncx) when there are multiple headers in a file. If there is only one header, the id is not used.
Although you pattern seems nice, there is a big issue with it. It involves logic which might not be there. You assume a header/chapter numbering although it may not be there or follow a different pattern. Also, since the id's are only used in case of multiple headers of the same style in a file, inconsistent numbering will be the result.
You can of course change it manual later.
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