This is a feature request.
Support for Latin characters with diacritics needs to be extended.
I found the following characters that aren't present in IBM Plex font family.
- ṭ
- ḍ
- ṣ
- ḥ
- ṁ
- ṃ
- ṅ
- ṇ
- ḷ
These characters are extensively used for Roman Transliteration of Sanskrit/Devanāgarī alphabets.