How to call API in custom widget

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i had custom widget import from pub.dev then i want to display json data into custom widget in FF

example marquee and display

Widget buildComplexMarquee() { return Marquee( key: Key("$useRtlText"), text: !_useRtlText ? 'Some sample text that takes some space.' : 'ื–ื”ื• ืžืฉืคื˜ ืจืืฉื•ืŸ ืฉืœ ื”ื˜ืงืกื˜ ื”ืืจื•ืš. ื–ื”ื• ื”ืžืฉืคื˜ ื”ืฉื ื™ ืฉืœ ื”ื˜ืงืกื˜ ื”ืืจื•ืš', style: TextStyle(fontWeight: FontWeight.bold), scrollAxis: Axis.horizontal, crossAxisAlignment: CrossAxisAlignment.start, blankSpace: 20, velocity: 100, pauseAfterRound: Duration(seconds: 1), showFadingOnlyWhenScrolling: true, fadingEdgeStartFraction: 0.1, fadingEdgeEndFraction: 0.1, numberOfRounds: 3, startPadding: 10, accelerationDuration: Duration(seconds: 1), accelerationCurve: Curves.linear, decelerationDuration: Duration(milliseconds: 500), decelerationCurve: Curves.easeOut, textDirection: _useRtlText ? TextDirection.rtl : TextDirection.ltr, ); }

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