@jeffford Thanks for joining the site! Great to have you on the VHT forums community. To answer your question. Yes, you should be able to do LACP for both of the SFP plus interfaces. In Winbox:
Also, I was just looking and found a user on Reddit that looks to have experimented around with LACP on the CRS310-8G+2S+IN and they posted their config here: CRS310-8G-2S-IN - Config Help Layer2 Only with 802.3ad LAG : r/mikrotik (reddit.com)