adding only specific IP in VPN settings

[mahak]

Hi,

Can anyone tell me if we can add only specific IP address instead of subnets in the VPN settings under Routing.
Under the below box in admin console-

Specify the private subnets to which all clients should be given access (as 'network/netmask_bits', one per line):

Also if cannot be done is there are other possible way to include only specific IP address rather than subnets in openvpn allowed connections?

Thanks in advance