$ projinfo -s "WGS84" -t "epsg:5819"
Candidate operations found: 1
-------------------------------------
Operation n°1:

unknown id, Inverse of Null geographic offset from WGS 84 to WGS 84 + EPSG topocentric example A, 0 m, World

PROJ string:
Error when exporting to PROJ string: Unsupported conversion method: Geographic/topocentric conversions