Custom Fields add suffix (or prefix)

See https://docs.pods.io/displaying-pods/magic-tags/display-filters-with-magic-tags/

Define a formatting function using a Code Snippet plugin, plugin added to wp-content/plugins or wp-content/mu-plugins, or theme’s functions.php:

<?php
/**
 * Plugin Name: Format Surface Area
 */
function fmt_area( $number ) {
    // Second argument is number of significant figures.
    $number = number_format( $number, 1 );

    // Replace '.0' with nothing.
    $number = str_replace( '.0', '', $number );

    // Output template, where %s is the variable placeholder.
    // @see https://www.php.net/manual/en/function.sprintf.php
    return sprintf(
        'Surface: %sm²',
        $number
    );
}

Then, if the function is named fmt_area, add fmt_area to the comma-separated list of allowed display callback functions near the bottom of Pods Admin > Settings, and use the callback function by adding its name after a comma in the magic tag, for example {@surface,fmt_area}