Possible solution to get the ACF field values by passing the field key, if we want to use the field data from the parent block inside a child block.

get_acf_fields_from_parent_block.php

<?php

/*
* Example
*/

$my_acf_field = get_parent_block_acf_field( $context, 'field_5d4a9875f0c8d' );
$my_acf_field_2 = get_parent_block_acf_field( $context, 'field_622746ee08ac6' );

if( $my_acf_field ) {
    echo 'The field from the parent block is active.';
}

/*
* Pass ACF field data from parent block to innerBlock childs using "usesContext": ["acf/fields"] via block.json file
*/

if ( ! function_exists( 'get_parent_block_acf_field' ) ) :

	function get_parent_block_acf_field( $fields, $field_key = '' ) {
		
		// Get the parent block ACF fields from $context if provided
		$fields = isset( $fields['acf/fields'] ) ? $fields['acf/fields'] : array();
		
		// Check if the field key exists (used in the block editor)
		$field = isset( $fields[$field_key] ) ? $fields[$field_key] : '';
		
		if( $field ) {
			return $field;
		}
		
		/*
		* Collect all fields 
		*/
		
		$keys = array();

		foreach( $fields as $key => $value ) {
			
			// Check for nested field keys
			if( strpos($key, 'field_') !== false && is_array( $value ) ) {
				
				foreach( $value as $sub_array_key => $sub_array_value ) {					
					// Remove the prefixed clone field key, to provide the correct field key
					$sub_array_key = str_replace( $key . '_', '', $sub_array_key );
					
					$keys[$sub_array_key] = $sub_array_value;
				}
				
			} else {
				$keys[$key] = $value;
			}
		}
		
		/*
		* Get / return the ACF field value by field key
		*/
		
		$field = isset( $keys[$field_key] ) ? $keys[$field_key] : '';

		if( $field ) {
			// Return the field value if exists
			return $field;
		}
		
		// Check all ACF fields
		foreach( $keys as $key => $value ) {
			
			// Check if a field key value contains the searched field key
			if( $value === $field_key ) {
				
				// Remove the underscore from the ACF field name
				$key = ltrim( $key, '_' );
				
				// Get the ACF field by field name
				$field = isset( $fields[$key] ) ? $fields[$key] : '';
				
				if( $field ) {
					// Return the field value if exists
					return $field;
				}
				
			}
			
		}
		
	}

endif;