If you have relatives that were buried at Providence Chapel, St Brides Wentlooge I have two lists of grave inscriptions and a location map for each headstone. Note that these notes were put together before 1998 and may therefore omit any more recent burials; also note that the Chapel is now a private residence and the gravestones have been moved.
The first list contains 32 entries and a related diagram indicates where each stone was originally placed; the second list contains much more detail of dates and inscriptions but is in a different list order so some cross-mapping is needed. It is possible that pictures and some details may be available on, e.g. Billion Graves or similar sources - I have not checked that.
The family names represented are:
Bonithon, Buckler, Cole, Davies, Evans, French, Fry, Harding, Harris, Harvey, Jenkins, Jones, Joseph, Little, Llewellyn, Sims, Sully, Tarr, and Williams. If any are relevant to you PM me and I will transcribe the headstone details from the 4 pages of A4 I hold.
Chapel built in 1826, last burial on list 1969.