Is it possible to get objects from an excel file?

You can create an instance of the com.kms.katalon.core.testobject.TestObject class by code. See

import com.kms.katalon.core.testobject.TestObject
import com.kms.katalon.core.testobject.ConditionType
...
TestObject testobject = new TestObject("1st mail sender")
String expr = '//table/tbody/tr[1]/td[5]/div[2]/span/span'
testobject.addProperty("xpath", ConditionType.EQUALS, expr)

Here you need to specify 2 string values as parameters. You should be able to pick up the id and xpath from your excel file and use them.