Static parameters in custom online maps

When creating multiple Custom Online maps, is it possible to use the token and API key as parameters and only use it once?

It would be nice to create a parameter at the top like the example below and apply it to multiple maps, but I can't find such a parameter

<?xml version="1.0" encoding="UTF-8"?>

<parameter name="key">123456789</parameter>

<providers>

<provider id="3000" type="0" visible="true" background="-1">

<name>Thunderforest Map</name>

<mode>Outdoors(HD)</mode>

<countries>World</countries>

<url><![CDATA[https://tile.thunderforest.com/outdoors/{z}/{x}/{y}.png?apikey={k}]]></url>;

<zoomPart>{z}-8</zoomPart>

<zoomMin>8</zoomMin>

<zoomMax>29</zoomMax>

<tileSize>256</tileSize>

</provider>

.

.

.

</providers>