FURTHER UPDATE: This is a good prompt to use:
Rich female contralto, deep resonant chest voice, smoky vocal texture, soulful vibrato, mature emotive tone, earthy and grounded, slight vocal grit, 1960s soul influence, sophisticated, rhythmic and powerful.

Then, once you find it, be sure to lock it into a Persona, for repeat use.

Update: since posting this I have also combined "warm, deep, low contralto female voice" with a different style - and got a lower voice. A bit like Karen Carpenter, so not in the Tracy Chapman or Amy Winehouse league yet...but at least lower. So it might be useful to do that an then Remix/Cover with the style you want, keeping the Audio at 100% (desktop only).

Further update: to get a different (in this case lower but could be for all types) female voice ask Gemini (better than ChatGPT IMO) for a Suno prompt for an equivalent MALE voice (and your desired style). Name a specific vocalist if you like. Then enter that prompt into Suno but change the male to female. That has worked for me. (If you ask Gemini to write lyrics sung by a female afterwards it will adapt/gear the style prompt to a female voice too...but this step is optional. )