Feature request: fallback / conditional transforms for summary string templates

Feature request: fallback / conditional transforms for summary string templates: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm using summary string templates with filter syntax to format entry summaries. Right now I can use upper , lower and date('<format ')…

The task

I'm using summary string templates with filter syntax to format entry summaries. Right now I can use `upper`, `lower` and `date('<format>')`, which is great, but I keep running into two cases that aren't covered.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.