Cypher query, format/group return values

Is there a way to format the return values from a cypher query? If I do a query that returns a node and all nodes with a relation to that node ('RETURN id(startnode), id(relationnode)') i will get an array containing each relationnode with a startnode bundled.

E.g:

[
    {
        relationnode: 0, 
        startnode: 1
    }, {
        relationnode: 1, 
        startnode: 1
    }
]

How i much rather would have it work, is to have the return values formated something like so:

{
    relationnode: [
        0, 1
    ],
    startnode: 1
}

Is there a way to accomplish this, or is it just bad practice all together? This would be very useful if i knew that there would never be more than 1 startnode.

Edit: I know i could parse it after the query, I'd much rather be able to do it in the query though.