Hi,
It doesn’t seem to be possible to export single intents in Dialogflow CX (like in Dialogflow ES).
However a possible workaround could be exporting flows [1] or the entire agent [2], and then to keep only the intents you need, by removing the others.
[1]: https://cloud.google.com/dialogflow/cx/docs/concept/flow#export
[2]: https://cloud.google.com/dialogflow/cx/docs/concept/agent#export