Clarification on Stratum V2 (Translator Proxy) on Umbrel - Is it truly "Solo" or just a Proxy?

I am running a Bitcoin Node on Umbrel (full node, fully synced) and I recently set up the "Stratum V2" app. I have a question regarding how it operates:
1 Architecture: When using the Stratum V2 app on Umbrel, am I correct that it acts strictly as a "Translator Proxy"? It takes Stratum V1 from my miners, translates it to V2, and forwards the shares to an external pool (like PublicPool).
2 Sovereignty: If the above is true, where does the "Sovereign" part come in? I am running a full node on my Raspberry Pi 5 to ensure sovereignty, but it feels like the current setup still relies on an external pool to provide the block template.
3 The Gap: Am I missing a configuration to make this a truly "Sovereign Solo" setup where my own Bitcoin Node generates the block templates locally? Or is this limited by the current Umbrel containerized environment (lack of IPC socket access)?
Any technical explanation on what is happening under the hood would be greatly appreciated. I want to ensure my setup is as independent as possible

Is there anyone who can help me understand what is happening here or explain it to me exactly? I have been using AI to help formulate these questions and I am still not clear on the technical reality of my setup