Any way to merge two WhatsApp accounts while keeping all group chats?

Hi everyone,

I’m looking for advice on merging two WhatsApp accounts into one. I currently have two separate accounts (one on regular WhatsApp and one on WhatsApp Business), and I want to end up with just a single regular WhatsApp account.

The main thing I want to keep are the group chats from both accounts.

Has anyone successfully done this, or found a workaround to transfer groups or merge accounts?
Is manually adding my new number to each group the only method?

Any tips would be appreciated!