format LT moment with am / pm / h unit depending on locale

I have to handle two locales for en and fr and display formatted hours depending on locale.

I try to do this :

  const hour = moment({
    hour: 15
  }).format('LT');

It display 15:00 for fr and 3:00pm for en . I want 15h for fr format and 3 pm for en.

I tried to use the updateLocale method to add specific options, with LT format, but I can't arrive at the result.

    const optionsFR = {
      longDateFormat: {
        LT: 'HH:mm',
      },
      meridiem: (): string => 'h',
    }
    
    const optionsEn = {
      longDateFormat: {
        LT: 'h:mm a',
      },
      meridiem: (): string => 'h',
    }

moment.updateLocale(locale, options);

I could modify the LT option to do LT: h a for en and LT: HH for fr. but I can't display 'h' unit for fr-fr. Do I have to do it manually?

from format LT moment with am / pm / h unit depending on locale