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WP5.9 add external script to FSE template

I want to add an external JS script to my FSE template ONA. I try to put it on header.html bug nothing happen in the source code…

Do u have any ideas ?

Example

<!-- wp:group {"style":{"spacing":{"padding":{"right":"4%","left":"4%","top":"30px","bottom":"30px"}}},"layout":{"inherit":false}} -->
<div class="wp-block-group" style="padding-top:30px;padding-right:4%;padding-bottom:30px;padding-left:4%"><!-- wp:columns {"verticalAlignment":"center","isStackedOnMobile":false,"style":{"spacing":{"blockGap":"0px"}},"className":"is-style-no-spacing"} -->
<div class="wp-block-columns are-vertically-aligned-center is-not-stacked-on-mobile is-style-no-spacing"><!-- wp:column {"verticalAlignment":"center","width":"25%"} -->
<div class="wp-block-column is-vertically-aligned-center" style="flex-basis:25%"><!-- wp:site-title {"style":{"typography":{"textTransform":"uppercase","letterSpacing":"10px"}},"className":"ona-site-title","fontFamily":"base"} /-->
<script type="text/javascript" src="myurl"></script>
<!-- wp:site-tagline {"style":{"typography":{"fontSize":"12px"}}} /--></div>
<!-- /wp:column -->