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According to ISC DHCP dhcp-eval(5):

   log (priority, data-expr)

     Logging statements may be used to send information  to  the  standard
     logging  channels.  A logging statement includes an optional priority
     (fatal, error, info, or debug), and a data expression.

     Logging statements take only a single data expression argument, so if
     you  want  to  output  multiple data values, you will need to use the
     concat operator to concatenate them.

It is an interesting feature which was discussed before (cf #4124). To implement it in the ISC DHCP style we need 3 parameters:

• a boolean expression
• a priority
• a string expression to log

It does not seem so hard to do...