Hiero sg_exr_in field to Number type Field

Hi there!
We are trying something simple. Add 24 frames on a Calculated Field on Shotgrid.
But the fields sg_exr_in/sg_exr_out generated by NukeStudio on the export, are a Text Field. And there is no way, to converte these, to a Number field, to use a Calculated Field with a formula like “{sg_exr_in} + 24” .
Any help? Ideas?
Many Thanks

Captura de pantalla 2023-06-15 a les 18.17.46