Offset Path/Make stroke on export

When I design a font with lines only (not filled areas) and want to let Glyphs apply the Offset Path + Make stroke filter on export, how do I set this up?
I guess I need to type the parameters in the Font Info dialog. Is that documented somewhere?

With a custom parameter in the respective instance.

Property: Filter
Value (example): GlyphsFilterOffsetCurve;3;3;1;0.5

You can find documentation in the application help file (click on the question mark next to the plus and minus buttons) as well as in the appendix of the handbook (p.88).

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Thanks!