In the present you can configure filter settings with operators and values programmatically. The user can also filter values using the FilterBar mode and some special characters to describe oprerators like > or <=.
The problem is when using the programmatic configuration there is no way for the user to know the operator used because the only thing visible in the filter bar is the operator. You can see in the following exemple that we don't know the nature of operator:
I'd like the ability to have methods which can make the translations in both sides from FilterBar to FilterSettings and FilterSettings to FilterBar. This would allow developpers to use a custom grammar and allow to display operators on FilterBar correctly when using programmatic filtering.