Logic Apps: Value mapping (key-value pair) - XML Transformation

Hi all,

I have just started with Logic Apps. My first app is running. It contains a XML transformation (XSLT3).

Within the XSLT I have to map some values.
My first approach was to put this mapping values as xsl:map into the stylesheet. Works fine.

Actually, I want this part to be more flexible. I am looking for something where I can store the value mapping table, which can be easily changed, e.g. a separate XML which will be passed to the XSLT (xsl:params) or parameters from the app.

I was wondering if you can point me to the right direction what can be used for that.

Thank you in advance
Seb