How to use multiple properties files as user can't access property files that are placed in {fuse-home}/etc ?

Issue

• Why user can't access property files that are placed in {fuse-home}/etc directory?
• User added these files...

{fuse-home}/etc/x-y-z-a.cfg
{fuse-home}/etc/x-y-z-b.cfg

• User gets this error trying to access the properties in the camel context.
• Attribute 'location' is not allowed to appear in element cm:property-placeholder. With below config...

        <camelContext id="id1" xmlns="http://camel.apache.org/schema/blueprint">
            <package>xx.yy.zz.camel.routes</package>
        </camelContext>

        <cm:property-placeholder id="default" persistent-id="x-y-z" placeholder-prefix="${" placeholder-suffix="}" >
            <cm:default-properties>
                <cm:property name="key1" value="value1"/>
                <cm:property name="key2" value="value2"/>
            </cm:default-properties>
        </cm:property-placeholder>

        <cm:property-placeholder id="id2" persistent-id="a-b-c" 
            location="file:${karaf.home}/etc/a-b-c.cfg" placeholder-prefix="$(" placeholder-suffix=")" />
        <cm:property-placeholder id="id3" persistent-id="m-n-l" 
            location="file:${karaf.home}/etc/m-n-l.cfg" placeholder-prefix="$[" placeholder-suffix="]" />

• User is getting below error
• Invalid content was found starting with element propertyPlaceholder, with below config.

        <camelContext id="contextId4" xmlns="http://camel.apache.org/schema/blueprint">
            <package>xxx.yyy.zzz</package>
            <propertyPlaceholder id="id1" location="blueprint:aa-bb"/>
            <propertyPlaceholder id="id2" location="blueprint:xx-yy"/>
        </camelContext>

        <cm:property-placeholder id="id1" persistent-id="aa-bb-cc-xx" placeholder-prefix="$(" placeholder-suffix=")" />
        <cm:property-placeholder id="id2" persistent-id="aa-bb-cc-yy" placeholder-prefix="$[" placeholder-suffix="]" />

        <cm:property-placeholder id="id3" persistent-id="aa-bb-cc-zz">
            <cm:default-properties>
                <cm:property name="key1" value="value1"/>
                <cm:property name="key2" value="value2"/>              
            </cm:default-properties>
        </cm:property-placeholder>

• And when user try this config, only the default properties are being discovered.

      <camelContext id="id1" xmlns="http://camel.apache.org/schema/blueprint">
          <package>xxx.yyy.zzz</package>
      </camelContext>
  
      <cm:property-placeholder id="id1" persistent-id="aa-bb-cc-xx" placeholder-prefix="$(" placeholder-suffix=")" />
      <cm:property-placeholder id="id2" persistent-id="aa-bb-cc-yy" placeholder-prefix="$[" placeholder-suffix="]" />
  
      <cm:property-placeholder id="id3" persistent-id="aa-bb-cc-zz">
          <cm:default-properties>
              <cm:property name="key1" value="value1"/>
          </cm:default-properties>
      </cm:property-placeholder>