Can't apply xml-configuration for logback from config server - spring-boot

Question

I'm developing an application with springboot which has an microservice architecture.
There is Service A (Port 8080) and spring cloud's config-server (Port 8888), which provides the properties-file for Service A from a Git-Repo (located locally under the ~/git//config).
This works well so far and Service A receive the properties-file from config-server.
For logging i use the logback logging framework and created a XML-Configuration file named logback-spring.xml with following content:
<?xml version="1.0" encoding="utf-8"?>
<property name="LOGS" value="./logs" />
<appender name="Console"
class="ch.qos.logback.core.ConsoleAppender">
<layout class="ch.qos.logback.classic.PatternLayout">
<Pattern>
%highlight(%-5level) %black(%d{ISO8601}) [%blue(%t)] %yellow(%C{1.}): %msg%n%throwable
</Pattern>
</layout>
</appender>
<appender name="RollingFile"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${LOGS}/spring-boot-logger.log</file>
<encoder
class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
<Pattern>%d %p %C{1.} [%t] %m%n</Pattern>
</encoder>
<rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!-- rollover daily and when the file reaches 10 MegaBytes -->
<fileNamePattern>${LOGS}/archived/spring-boot-logger-%d{yyyy-MM-dd}.%i.log</fileNamePattern>
<timeBasedFileNamingAndTriggeringPolicy
class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>10MB</maxFileSize>
</timeBasedFileNamingAndTriggeringPolicy>
</rollingPolicy>
</appender>
<root level="info">
<appender-ref ref="RollingFile" />
<appender-ref ref="Console" />
</root>
<logger name="com.example" level="trace" additivity="false">
<appender-ref ref="RollingFile" />
<appender-ref ref="Console" />
</logger>
I want to distribute this configuration file to Service A by the config-server to have a central point to manage this for all future services.
Inside of the git-repo for config i created a directory named logging with that file inside. So the local path to that file is: ~/git//config/logging/logback-spring.xml.
Related to the docs(documentation of config server) in my case i can retrieve this file with curl localhost:8888/config/spring/main/logging/logback.xml and when i curl this i get the content from this file.
But now the problem:
I specified this logging.config - location to this endpoint to let springboot load this XML file as a config client. The application-properties in Service A has following content:
When i start Service A while hoping to get this configuration appended to the logs, i am getting following error:
How can i properly include the configuration to Service A?
Appreciate any help.