Local language override needed beyond<Textblock> and <Paragraph> to also include <Fontface> or <Value>

[webservant316]

Currently a local language override is only available for <Textblock> and <Paragraph>. However, in my use case I also need the local language override also in either <Fontface> or <Value> to support this possibility...

<Fontface fontfamily=""><Value>Foreign text in middle of textblock or paragraph</Value></Fontface>

In this use case paragraph rules would not matter, but the RTL and Hindic glyph placement will need Harbuzz expertise. I suggest the additional tags <Fontface> or <Value> for the language attribute, but maybe <Span> would be an even better, more general solution?