It is possible using rasterization. Basically, create a new PDF/A-1B based on the rasterized page of the existing PDF (you will probably find a lot f such example into his section), then ocr the generated PDF using the OCRPages() method.
In a future version that should be published really soon you will be able to convert any existing PDF to any conformance without the need to rasterize it.
Please let us know if you need further information or assistance.
With best regards,
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