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So, I found an answer to my question.I needed to insert default scope template into the header column without prop so i can pass my own value.
<el-table-column prop="patron" label="Patron"></el-table-column>
<el-table-column label="Sex">
<template #default="scope">
<span v-if="scope.row.sex === 1">Male</span>
<span v-else-if="scope.row.sex === 2">Female</span>
</template>
</el-table-column>
<el-table-column prop="dept" label="Dept"></el-table-column>
Source:stackexchange.com