Font diacritics

Hi, I don't know where to start so here it is: is it possible to include romanian language diacritics/glyphs in some specific fonts? There are a handful of fonts that include romanian diacritics but if I absolutley love one font, can I ask the founder to help with this?

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Romanian orthography does not use accents or diacritics – these are secondary symbols added to letters (i.e. basic glyphs) to alter their pronunciation or to distinguish between words. There are, however, five special letters in the Romanian alphabet (associated with four different sounds) which are formed by modifying other Latin letters; strictly speaking these letters function as basic glyphs in their own right rather than letters with diacritical marks, but they are often referred to as the latter.

• Ă ă — a with breve – for the sound /ə/
• Â â — a with circumflex – for the sound /ɨ/
• Î î — i with circumflex – for the sound /ɨ/
• Ș ș — s with comma – for the sound /ʃ/
• Ț ț — t with comma – for the sound /t͡s/

Thanks!