When programming, you should use ODS OUTPUT statements to store informations displayed by your regression task into SAS datasets, so that you can re-use them to compute ratios or anything else.
Assuming that you're using PROC REG as a regression program (check the log in your task, or the generated code, if you have any doubt), that would mean doing something like :
ODS OUTPUT nObs = work.obs_number
(WHERE = (label = "Number of Observations Used"))
parameterEstimates = work.tstats ;
/* here just copy and paste the PROC REG code built by your Enterprise Guide task */
DATA work.t ;
MERGE work.tstats
work.obs_number (KEEP = NobsUsed) ;
ratio = tValue / NobsUsed ;
RUN ;
PROC PRINT DATA = work.t LABEL ;
RUN ;
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