Now that Local includes composer, how do i install INTL?

I had to leave Local for MAMP Pro because I needed php intl.
But MAMP is slow and I miss Local.
Now that Local includes composer, what should I do to add INTL to PHP on MacOS Catalina?

@clay I see that there is libintl.8.dylib, but I cannot use it (NumberFormatter for example).
intl seems not to be loaded. phpinfo() does not mention it.
How can I use this PHP extension on MacOSX Catalina?

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