How to add an integer type custom field values under Available Filters

I wanted to add a second custom field (integer type) in the available filters as a ‘Contains’ type search.  I am already using another custom field (integer type)by via the formula(text) . As I discovered, I am unable to use two ‘Formula (text)’ in available filters due to error- ‘Filter must be unique’.

Is there any way in which I can bypass this limitation in Saved Searches? Perhaps change data type of the values of a column from integer type to another which allows filters?

Any direction will be helpful.

Thanks