Can I use jinja?

You can use jinja in your Cube data models!
Check out this handy cheatsheet to get started using jinja pre-processing syntax in your data models
e.g.

cubes:
  - name: customers
    title: My customers
    sql: >
      select * 
      from public.customers 
	  {% if COMPILE_CONTEXT.securityContext.superUser %}
		where 1 = 1
	  {% else %}	
	    where organisationId in {{ list(COMPILE_CONTEXT.securityContext.orgIds) }}
	  {% endif %}