Print set and maps

Hi
Is there any standard way to generate strings that contain the content of
sets/maps (standard, Batteries or Core) ?
I wrote several to_string functions (either using the print function of
Batteries or just by converting type to lists and then printing it with the
BatList module's print function) for these types.
I however would rather use something from the library instead (especially
for Core). I tried to read the doc (
https://ocaml.janestreet.com/ocaml-core/latest/doc/) but I did not get any
results.
Is there anything that would do the job ?
Thank you for your time.
Johan