value not show on html

hello

i try to add this code to a block

<audio id="player" controls>
    <source src="asmaa {{podcast-url}}" type="audio/mp3" />
</audio>
<script>
    const player = new Plyr('#player');
</script>

to show a podcast player, on back end it work fine no issue but on front end on source code i nothing show on src=”” , i try create another block also for video player still not show ,,,

when i try add the variable on template file it work

<p><?php echo get_lzb_meta( 'podcast-url' ); ?></p>

it show the full mp3 url ,

thank you