v1.2.0 is live in the Library Manager, and adds support to SDRAM
using it works the same as it does in libdaisy:
To use the SDRAM you can declare any type as a global variable using the DSY_SDRAM_BSS attribute.
For example:
// This creates 1MB of chars
char DSY_SDRAM_BSS my_big_buffer[1024*1024];
void setup() {}
void loop() {}