Conditional range formatting in PHPSpreadSheet by median - how to implement?

Question

PHP

If you unpick xlsx, then the conditional formatting of the range by median looks like this:

<conditionalFormatting sqref="C6:E6 G6:I6">
        <cfRule type="colorScale" priority="72">
            <colorScale>
                <cfvo type="min"/>
                <cfvo type="percentile" val="50"/>
                <cfvo type="max"/>
                <color rgb="FFF8696B"/>
                <color rgb="FFFFEB84"/>
                <color rgb="FF63BE7B"/>
            </colorScale>
        </cfRule>
    </conditionalFormatting>

Such formatting must be specified in a sheet created from scratch.
In the documentation and source codes (Constants of the Conditional class) I did not find a similar type of formatting.
Is there such a feature in PHPSpreadSheet and in which direction to dig if it is not?
Append XML line by line?