Table of contents Headings offset: non-pixel units, breakpoint support

Would it be possible to add support for non-pixel units for the Headings offset value in the Table of contents element? Not sure how difficult that is to implement with the tocbot library Bricks is using.

Also, per-breakpoint values would be nice. There’s a bug ticket from last year that mentions it: WAIT: Table of Contents Headings Offset and Sticky