Hi @savi50
You can write a sling model for this. Read the page path from the multifield into the sling model. Once you have the page path get it as a resource then adapt it to a Page object. With getProperties() method you can fetch the properties from a Page object.
Below piece of code might help you to get started.
Resource resource = resourceResolver.getResource(<PAGE_PATH_FROM_MULTIFIELD>;
Page page = resource.adaptTo(Page.class);
ValueMap pageProperties = page.getProperties();
Thanks,