spectre input.cs : conditional equation in .measure (min of 2 measurements)

Hello,

using spectre in batch mode, I am trying to define the following conditional equation, to measure a capacitance.
I would like to know how to get the minimum between two parameters: maxvbl and V0 in my case, using the .measure strategy ?

input.scs extract:

parameters I0=10e-06
parameters V0=1.0
...
save blo\<16\> gslo\<0\>
...
.measure tran maxvbl max v(blo\<16\>)
.measure tran trigger param= 'min(maxvbl:V0)' <- conditional equation
.measure tran meas_when_trigger when v(blo\<16\>)='trigger'
.measure tran dvbl deriv v(blo\<16\>) at='meas_when_trigger'
.measure tran cbl param='I0/dvbl'

I cannot use spectremdl or ocean, using .measure syntaxe is somewhat mandatory to solve this point.

Thanks a lot in anticipation for any help,

P.