Why dosn't 'Time to first reponse' SLA column pull through when I Export CSV?

[Deleted user]

I want to pull through the Time to first Response SLA when I'm Exporting data, however it does not pull through ALL columns in my saved searches - only default ones. 

Please let me know how I can pull my own saved search columns through in Export. Thanks

[Jack Brickey]

Some values are calculated values within the application. Only actual fields are exported. TTR is one such field.