[otrs] FreeText fields in Search: How to do 'greater then' search?

Hi everyone, for supporting a software product I added a FreeText field storing the software version. I want to use this in search but I don't want to search for one specific version but for a range. So I need operators like <, >, <>, =. Example search parameters: Fulltext: ABC Version: > 8.80 Example search result: Text: ABCDEFG Version: 9.10 Text: 123ABCDEFG Version: 8.90-f Is this possible? Can I somehow provide my own search logic & form elements for FreeText fields? Cheers, Axel