Signing arbitrary non-transaction data

[hwnprsd]

I'm a developer transitioning from the EVM ecosystem, and I'm working on integrating TON into our application. On Ethereum, we commonly use wallets like MetaMask to request arbitrary signatures from users using methods such as personal_sign. This allows for functionalities like user authentication and off-chain message signing without the need for on-chain transactions.

I've reviewed the Tonkeeper documentation but haven't found a way to replicate this functionality. I'm reaching out to inquire:

Does Tonkeeper currently support signing arbitrary data?
If not, are there plans to implement a feature similar to personal_sign?
Are there any recommended approaches or workarounds to achieve this on TON?
Implementing this feature would greatly benefit developers looking to create seamless user experiences similar to those in the Ethereum ecosystem.