GFORM: Dynamically populate select field choices

# References: 
# https://docs.gravityforms.com/dynamically-populating-drop-down-fields/
# https://docs.gravityforms.com/gf_field_select/

add_filter( 'gform_pre_render_45', 'disable_ADA_ACA_transactions' );
add_filter( 'gform_pre_validation_45', 'disable_ADA_ACA_transactions' );
add_filter( 'gform_pre_submission_filter_45', 'disable_ADA_ACA_transactions' );
add_filter( 'gform_admin_pre_render_45', 'disable_ADA_ACA_transactions' );
function disable_ADA_ACA_transactions( $form ) {

	$field = GFFormsModel::get_field( $form, 7 ); // 7 here is the ID of the select field I want to alter.
	$exclude = ['ADA', 'ACA'];
	$choices = [];
  
  // What Im doing here is - removing specific choices for currently loggedin user
	foreach ($field->choices as $key => $choice) {
	   	if ( current_user_can('support-gta-link') && in_array($choice['value'], $exclude)) continue;
	   	$choices[] = [ 
	   		'text' => $choice['text'],
	   		'value' => $choice['value']
	   	];
	}
    // Update/Assign the new choices base from logic perform above
    $field->choices = $choices;
  
    // Return the form  
    return $form;
}

# IMPORTANT NOTE: Form ID: 45 <change accdg. to your specific form id>