No you can’t. You’re being silly. They don’t even support lacp with more than 2 members out of the box. No gateway groups, no unbound with adjustable cache ttl and cache revalidation. I would know I switched away from Asus specifically because of it’s shortcomings, many of which cannot even be fixed by ddwrt such as low system memory for state table, which btw can easily be filled up by torrenting. My opnsense box has a huge state table because I just dropped in 8GB of ram.
You only need to look at the Asus router admin interface to see how many more pages of configuration options opnsense has.