Post meta data

Kind thanks for your excellent plugin. But I have a question. How can I add post meta data to post submission? I have a real estate agency and the price there fits in the meta data:

<div class="rh_form__item rh_form--3-column rh_form--columnAlign">
	<label for="price"><?php esc_html_e( 'Sale or Rent Price', 'framework' ); ?></label>
	<input id="price" name="price" type="text" value="<?php
	if ( inspiry_is_edit_property() ) {
	    global $post_meta_data;
	    if ( isset( $post_meta_data['REAL_HOMES_property_price'] ) ) {
	        echo esc_attr( $post_meta_data['REAL_HOMES_property_price'][0] );
	    }
	}
	?>" title="<?php esc_attr_e( '* Please provide the value in digits only!', 'framework' ); ?>"/>
</div>
<!-- /.rh_form__item -->

Can you give me a hint, please? How do I output the price when sending a message to telegram.
Thank you in advance.