PeachDrawing.Text
PeachDrawing.Text.Shaping.ShapeSettings
ShapeSettings.ExplicitFeatures Property
Substitution (GSUB) features asked for by tag, or null for none. Positioning is not controlled this way: kerning is the Kerning setting.
public System.Collections.Generic.IReadOnlyList<PeachDrawing.Text.Shaping.FeatureSetting>? ExplicitFeatures { get; init; }