[exim] expanding variables in macro name

Hello, exim-users!
Is there are any possibility to expand an arbitrary variable into the
macro name?
For instance, Ihave several macros defined lke this
MACRO1=some data
MACRO2=another data
MACRO3=some other data

then have acl like this

warn set acl_c1 = ${some expansion}

where acl_c1={1..3}

Can I use my macros in the follow way?

MACRO${acl_c1}