You can! You’ll find the Time Signature and Tempo Editor via the Track menu.
If you have signature and/or tempo changes in your DAW, you might be able to export MIDI that contains that data and then import it via the same Track menu in EZbass.
More about the Time Signature and Tempo Editor tracks in the EZbass manual: https://www.toontrack.com/manual/ezbass/5/#5-4-the-timeline