The parameter set file .SSV of the SSP standard (a sibling standard to FMI) is intended for this (https://ssp-standard.org/)
If your importing tool supports the SSP standard, you can put the FMU together with a n .SSV parameter file in and SSP file.
The FMI project works on a Layered Standard FMI-LS-REF (https://github.com/modelica/fmi-ls-ref) you will also be able to put one or several  .SSV files in an FMU at a defined subfolder the /extra directory of an FMU.