Angular Translation Service

I would like to translate wordings from eng to chinese using a key-value mapping approach with angular translation service but i failed. Any ideas??

mapping json:

"At most {{ number }} wrods":"最多輸入{{ number }}字":


In typescript:

import { TranslateService } from '@ngx-translate/core';
...
this.translate = injector.get(TranslateService);
....
this.translate.instant(`At most ${50} wrods`);

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