I managed to find a solution:
{\rtf1\ansi\deff0
{\colortbl;\red188\green230\blue138;}
\trowd
\cellx1000
\clcbpat1\cellx2000 <!- \clcbpat1 = set background color -->
\cellx3000
cell 1\intbl\cell
cell 2\intbl\cell
cell 3\intbl\cell
\row
}
You can combine several colors, for example:
{\colortbl;\red188\green230\blue138;\red108\green030\blue038;}
And to use it, you call: \clcbpat1or\clcbpat2
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