[cairo] Writing PNG text information into a PNG using cairo-surface-write-to-png-stream

[Ben Bullock]

Is there any way to add text information as described in the PNG
specification here:

http://www.w3.org/TR/PNG/#11textinfo

to a Cairo-generated png when using the following function:

http://cairographics.org/manual/cairo-PNG-Support.html#cairo-surface-write-to-png-stream

? I can't see how to do this.