Is there any way where we can increase the size of EIT free text column more than 150 characters?

We have a requirement where we want to provided the information more than 150 characters in a single free text field. But as the EIT Table column size is only 150, we cannot do the same. So Is there any way where we can increase the size more than 150 characters ? Moreover we also want to change the shape/size of the free text field to BOX type, is that feasible to do. If so please let us know. Thank you.