How to configure memcache for heat on the overcloud via director/undercloud

Solution Verified - Updated -

Issue

we want to configure memcache for heat on the overcloud via director/undercloud.
It's not possible to enable memcache in the overcloud env adding the following parameters in a template file :

parameter_defaults:
    ControllerExtraConfig:
        #        Enable use of memcache cache for keystone.
        keystone::cache_enabled: true
        keystone::cache_backend: 'oslo_cache.memcache_pool'
        keystone::cache_memcache_servers: '"%{::fqdn}:11211"'

Environment

Red Hat OpenStack Platform 13 (RHOSP13)

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