Customise the modal form view

What's the best way to personalise the view of the forms inside modal?

My exact context is that I'd like to add a video (youtube) at the very bottom of my form. This form is currently configured on my VariablesRelationManager class, which is responsible for managing my Variable relationship.

class VariablesRelationManager extends RelationManager
{
protected static string $relationship = ‘variables;

public function form(Form $form): Form
{
return $form
->schema([
FormsComponentsTextInput::make(‘name)
->required()
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