Technically, it is possible to use first-person omniscient and third-person omniscient narrative voices together in a story, although this would be a highly unconventional approach. Combining different narrative voices can be challenging and may confuse readers, so it should be used with caution.

One possible way to combine first-person and third-person omniscient narrative voices is to use first-person omniscient for the majority of the story, but switch to third-person omniscient for certain scenes or chapters. This can create a sense of contrast and highlight certain aspects of the story. However, it's important to ensure that the shift in narrative voice is clear and consistent, and doesn't disrupt the flow of the story or confuse readers.

In general, it's best to choose a single narrative voice for a story and stick to it, as this can help create a more cohesive and effective narrative. However, if you do choose to experiment with different narrative voices, be sure to do so intentionally and with a clear purpose in mind.
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