Meta-analysis of calibration slopes

Hi all,
I want to perform a meta-analysis of prognostic models and I would like to pool calibration slopes since these were reported in various validation studies included in the review.
I found that one can use the valmeta() function from the metamisc package to pool O:E ratio or c-statistics. In the description of the function, it is described that the function can be used to pool calibration slopes, but I can’t find further information on the required arguments (there are only arguments for O:E ratio or c-statistics).

Therefore, my questions are:

  • Can the function that pools O:E ratios be used to pool calibration slopes?
  • If not, does anyone know functions in R (or even functions in other statistical programs) that can be used to pool calibration slopes?

Thank you very much in advance!