Create a Many to Many Polymorphic relationship custom table

How can I create a Many to Many Polymorphic relationship using this table:

model_has_tags

$table->increments('id');
$table->integer('tag_id');
$table->string('model_type');
$table->integer('model_id');
$table->timestamps();

Tags

$table->increments('id');
$table->string('name');

Users

$table->increments('id');
$table->string('full_name');

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