You have two possibilities: Simple and fast via the instruments or detailed, precise, and compliant with standards via the functionalities of the Coordinate Measurement module. Learn more here: Tutorials Coordinate Measurement - Introduction and Advanced.

Please deactivate the Option Filter Result on Tab Settings. Maybe the pores are detected but filtered out. Afterward, you can add an annotation on a pore that was not found before to find out which filter option is responsible and must be adapted (may it be probability, max. size, …).
When pores still are not found, activate the option Preview. This helps to analyze which settings must be adapted. To reduce time this approach could be performed on a small representative ROI.
Learn more here: Tutorial Porosity/Inclusion Analysis.

Once an analysis has been set up, it can be used in macros. To do so, save them as an evaluation and import it as a step of the macro. Learn more about macros here: Tutorial Automation with Macros and Batch Processing

Set up the views as desired, create a bookmark, and export it via the bookmark editor. When recording the macro, import the bookmark template and apply the bookmark. Learn more about rendering here: Tutorial Rendering a Volume Object.

Save the project via File > Pack and go, click Pack, and select the format .vgarchive.