NO, thats not possible, In order to login to ACS via GUI we have to use local administrator account defined on the ACS itself. ACS doesn't support admin login from any external user database like AD, RSA, LDAP etc.
Also the credentials used to login to the ACS CLI are entirely different than those used to authenticate at the ACS GUI screen and have absolutely nothing to do with credentials specified elsewhere in the network . To reach the CLI of your device, you only need to SSH to the IP of the ACS appliance. Once there, you should immediately be presented with a login as: prompt for your CLI credentials.
Feel free to contact me for any further queries.
Rgds, Jatin
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~Jatin