Select a default term based on user

I’m having trouble setting a default value & hoping you can guide me:

• I have a Custom Post Type called “Job” with a taxonomy select field called “job_manager”
• I have a Custom Taxonomy called “Manager” with a user select field called “wp_user”

When creating a new Job, I want to select the default value for “job_manager” to be the currently logged in user, but so far I’m having trouble understanding how the terms are attached and how to set the default term.

Basically, what value do I want from the Manager term? And how do I assign it as default

I’ve written code based on this guide: https://docs.metabox.io/edit-meta-boxes/ to modify the meta box.

add_filter('rwmb_meta_boxes', 'select_jobmanager_edit_meta_boxes', 20);
function select_jobmanager_edit_meta_boxes($meta_boxes)
{
    // Loop through all metaboxes
    foreach ($meta_boxes as $k => $mb) {
        if (isset($mb['id']) && 'job-personnel' == $mb['id']) {
            // Loop through all fields
            foreach ($mb['fields'] as $j => $field) {
                // Find the manager taxonomy field
                if ('job_manager' == $field['id']) {
                    // Here I'll get_current_user then find the "manager" term
                    // using get_terms/'meta_query' with matching the "wp_user"
                    // But what value do I need from the "manager" term & 
                    // and what property do I set on the field
                    $meta_boxes[$k][$j]['std'] = ['44'];
                }
            }
    }
}

// Return edited meta boxes
return $meta_boxes;
}