Available since 6.40.0
This field can be configured to display any SLA date of the issue. Possible dates can be: SLA Start, SLA End or SLA Target. If there are multiple SLAs for a single issue at the same time, it can be configured to pick the first or last date.
For example, below "Nearest SLA Target Date" field was created to display earliest target date. This feature is handy for sorting issues according to a date of SLA when there are multiple active SLAs at the same time (Time to SLA field can not be sorted when there are multiple values). For instance, below, there are a couple of SLAs for a single issue, but the earliest one is displayed as the value of SLA Date Field.
Simply go to Time To SLA Menu > Custom Fields