get execution time of a set of instruction instead of the time of the command

[gogo2464]

Is your feature request related to a problem? Please describe.
I would like to audit timing attack with rizin.

Describe the solution you'd like
A command such as exectime dso or anything to get the instruction execution time instead of the command execution time.

Describe alternatives you've considered
pd 1 @ rip ; time dso; but it return the dso time instead of asm execution. for example it currently return same time for dcu on 200 instruction as the time for dso for the single instruction.

Additional context
Can you provide me any tool that could fit my purpose please? Even if not included in rizin.