How to create indexes on expressions

I'm wanting to create a unique index with an expression to truncate a timestamp to minutes using postgresql's date_trunc. I'm unsure how to go about doing this with the drizzle orm core utilities.
https://www.postgresql.org/docs/current/indexes-expressional.html
https://orm.drizzle.team/docs/indexes-constraints#indexes
PostgreSQL Documentation
11.7. Indexes on Expressions # An index column need not be just a column of the underlying table, but can be
Drizzle ORM is a lightweight and performant TypeScript ORM with developer experience in mind.
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