WKT with PROJ-based operation method for QGIS

BOUNDCRS[
    SOURCECRS[
        PROJCRS["unknown",
            BASEGEOGCRS["unknown",
                DATUM["Unknown based on International 1924 (Hayford 1909, 1910) ellipsoid",
                    ELLIPSOID["International 1924 (Hayford 1909, 1910)",6378388,297,
                        LENGTHUNIT["metre",1,
                            ID["EPSG",9001]]]],
                PRIMEM["Greenwich",0,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8901]]],
            CONVERSION["unknown",
                METHOD["Transverse Mercator",
                    ID["EPSG",9807]],
                PARAMETER["Latitude of natural origin",0,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8801]],
                PARAMETER["Longitude of natural origin",-63,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8802]],
                PARAMETER["Scale factor at natural origin",0.9996,
                    SCALEUNIT["unity",1],
                    ID["EPSG",8805]],
                PARAMETER["False easting",29973.97,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8806]],
                PARAMETER["False northing",-1947925.94,
                    LENGTHUNIT["metre",1],
                    ID["EPSG",8807]]],
            CS[Cartesian,2],
                AXIS["(E)",east,
                    ORDER[1],
                    LENGTHUNIT["metre",1,
                        ID["EPSG",9001]]],
                AXIS["(N)",north,
                    ORDER[2],
                    LENGTHUNIT["metre",1,
                        ID["EPSG",9001]]]]],
    TARGETCRS[
        GEOGCRS["WGS 84",
            DATUM["World Geodetic System 1984",
                ELLIPSOID["WGS 84",6378137,298.257223563,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",4326]]],
    ABRIDGEDTRANSFORMATION["Transformation from unknown to WGS84",
        METHOD["PROJ-based operation method: +proj=pipeline
            +step +proj=unitconvert +xy_in=deg +xy_out=rad
            +step +proj=cart +ellps=intl
            +step +proj=helmert +convention=coordinate_frame +exact
                +x=1138.7432 +y=-2064.4761 +z=110.7016
                +rx=-214.615206 +ry=479.360036 +rz=-164.703951 +s=-402.32073
            +step +proj=cart +inv +ellps=WGS84
            +step +proj=unitconvert +xy_in=rad +xy_out=deg"]]]