Function set_metadata_ltr_and_rtl 

fn set_metadata_ltr_and_rtl(
    env: Env,
    style_value: &mut JsObject,
    ltr: &str,
    rtl: &Option<String>,
    consts_key: Option<&str>,
    consts_value: Option<&str>,
) -> Result<(), Error>

Sets LTR and RTL metadata properties on a JS object