How to add unnamed uci section if not exist?

I want to configure ipsec via uci (always ipsec[0]). Everything works correctly if ipsec section exists. I can modify ipsec using uci ipsec.@ipsec[0].type='tunnel'. But if ipsec section doesn't exist this command is not working. I want to add the ipsec section if not exist.

Solution

The only way I found is to use a shell script

if ! uci -q show ipsec.@ipsec[0]
then
    uci add ipsec ipsec
fi