extract ego_networks/sub-network in igraph

I have a graph of 169 vertices and 513 edges. I need to extract all ego_networks or sub_networks to get each node with its direct neighbours. I managed to do that using ego(graph) that produces each nodes with its direct neighbourhoods. However, the results of this functionn is a list of lists and could not extract each ego as a separate igraph or adjacency matrix object.

IS there a way to extract each ego_net as an igraph or adjacency matrix object?

sub1 <- ego(graph)

#sub1 is a list of lists that contain each nodes with its direct neighbours. 
I can access each ego network by sub1[1], sub1[2], ...etc. however, I could not extract each ego
as a separate graph object. 

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