how to add suffix ( extension ) to block list on firepower 9300

[fcbob]

Hi Guru's,

I was looking to block all domains ending with .bar to block list on firepower 9300. 

I tried with wildcard 8.bar to block domain list under objects>Security Intelligenec > dns list and feeds 

but its not working. Probably my version which is 6.2.3.10. 

Any suggestions to block all domains ending with suffix .bar.

Thanks