You will ask: what would be the use case for this?

Think about this situation:

- you have a stuck closing channel tx, was broadcast with low fee

- you used all funds, all utxos from your onchain node wallet

- in order to be able to push that tx you need to make a new deposit to your onchain wallet, you need a new utxo available in that wallet

- so you will have to do practically 2 txs: one to deposit, one to push the tx. So you will have to pay twice a fee.

Instead, you can just pay out of band from another wallet, just once and not using 2 UTXOs, or break an existing UTXO.

Now... you need to make the math if is worth it.