I believe that it is technically possible to connect i2s input via the LS header on the DB410c, however, the DI pin on the header is not connected. The signal that would otherwise be attached there is routed to a different pin on the LS header. You can use the SoC manual and schematics to find where that pin is physically connected.
If your goal is to build a mezzanine board, then I’d suggest selecting an SBC that actually has I2S-DI attached, such as Hikey960. If your goal is to build a completely custom board with APQ8016, then finding that pin and provisioning it for I2S-DI would be a reasonable choice.
If your goal is just to have an i2s “sound card”, then you may also look at https://groupgets.com/campaigns/485-i2s-mezzanine – but note that it won’t support i2s input on the DB410c either, unless you find that pin and jump it to the DI pin.