There is not really any "find and compare field", you will indeed need an app for that (and I'm not sure you can get one that will insert this into an automation)
Manually, you'll want to run a search for "text-field ~ "your text" and issuetype = issuetypeb" and then iterate through all the results creating an issue link for each one you find. This might not be that useful to you - the search for a text field is fuzzy.
Could you tell us what problem you are trying to solve with this linking? We may be able to find an alternative solution.
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