Case Sensitive Prompts/Query Filters

We are using Oracle as the backend and the data that is stored in the columns is Case Sensitive.

For example: If I have a Region Prompt (query filter) in my webi report and it is enabled as Free Text (instead of list of values), if I enter "Americas" as the prompt value. I do not get any results back. If I enter "AMERICAS" (uppercase) I get results back. This is because the data for Region Column is stored in UPPERCASE in the table and is case sensitive.

My Questions is:

1. Is there a way to convert the value entered in the Prompt to appropriate Case before it is being sent to the DB/Universe?
2. If not, what are the alternatives (list of values is not an option for us because it takes for ever to load) to achieve this requirement?

Ultimately the SQL Script should something like this - Select Region from Table01 where Region = UPPERCASE('Americas')

Any insights/suggestions are very much appreciated.