Add old Bulgarian letters Ѫ (U+046A, U+046B) and Ѭ (U+046C, U+046D)

Hello,
I use Source Serif Pro font on my website and on my forum too.
We use Traditional Bulgarian script (which was official in Bulgaria until 1945)
The traditional Bulgarian alphabet includes letters Ѣ, Ѫ and Ѭ
The letter Ѣ is already present in Source Serif Pro, but letters Ѫ and Ѭ aren't.

I would ask you to add these letters in the future into your cyrillic font glyphs.

P.S. Source Serif Pro already includes old cyrillic letters Ѳ (Fita) and Ѵ (Izhitsa)