JSON with PHP tags

Hi all!

I've created a custom language injection in Editor for validate tag 

<script type="text/x-magento-init">

as JSON. The problem is that in this JSON I am using a PHP tags like "<?= metodToReturnJSON(); ?>". In Editor I have error that value is missing and after make auto-formating, those tags are removed from JSON.

There are any possiblity to add ignore tags? Whitelist or etc? I'd like to do RegExp to don't throw error when value is as <?=  ?>

Full example:

<script type="text/x-magento-init">
    {
        "*": {
            "test": {
                "anyValue": <?= $block->metodToReturnJSON(); ?>
            }
        }
    }
</script>

After auto-formating

<script type="text/x-magento-init">
    {
        "*": {
            "test": {
                "anyValue": 
            }
        }
    }
</script>

What intresting as default  "text/x-magento-init" is renderer as "plain text" and after make auto-formating the breakline is added before </script> tag. Each next auto-formating is new line. Additionally, the format of JSON doesn't work for plain text. 

Can anyone give me tip what should I do to use auto-formating and those custom Magento JSON tags?