WPAllImport自定义php函数，用于在将数据导入自定义字段时裁剪数据

I have custom fields for the following in WPAllImport

1. _yoast_wpseo_focuskw

2. _yoast_wpseo_title

3. _yoast_wpseo_metadesc

For one and two I have used the field that is the product name. {column_2[1]}

For 3 I have used the field that contains the short description of the product. {column_24[1]}

For all of these fields I like to limit the number of characters used when importing. Is this possible please?

As an example [my_custom_function({column_2[1]})]

It is the my custom function part I am looking for which would limit the description of that field when it imports into WordPress.