Download graph from virtuoso in owl or nt format

I want to download an existing graph from virtuoso. I found dump function but it downloads in ttl format. However, I need owl or not file format.

Virtuoso only provides functions for dumping RDF graphs in TTL or NQUAD formats. If your graph is not too large then you could use a SPARQL construct query like construct {?s ?p ?o} from <graph-name> where {?s ?p ?o} and set the results output format to be N-Triple or RDF/XML (which I presume is what u mean by owl) or other available output format, see