How to create a custom field of relationship type?

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Hello. I am in the process of creating custom fields for a custom module. These fields must remain in the module’s main table, so they are being created manually by declaring them in ./custom/Extension/modules/<module>/Ext/Vardefs/<file>.php

This works fine, but I need to create a field of type relation. And I can’t find an example of how to do it in this context

This is what I’m trying

$dictionary['sonar_accreditation']['fields']['field_c'] = [
    'name' => 'field_c',
    'vname' => 'LBL_FIELD_C',
    'type' => 'relate',
    'link' => 'custom_tipo_pulsera',
    'table' => 'custom_tipo_pulsera',
    'join_name' => 'custom_tipo_pulsera',
    'module' => 'custom_tipo_pulsera',
    'required'   => false,
    'importable' => 'true',
    'reportable' => true,
    'audited'    => false,
];

Could you share an example with me? Thanks in advance