Export SSL certificates from Chrome for Android
Just faced with exactly the same problem. I googled for an answer but this is page the only case I found.

Solution is simple for rooted device:


Open and file explorer with root-access (I prefer ES file explorer)
Go to /data/misc/keystore/usesr_0 and find there the cert and key files.
Transfer it securely to your desktop. 


If you have a non-rooted device then root it and start with step &lt;1>.