a few thoughts, no answers.
Jeremiah Johnson is said to be mentioned in this book. Can you find a library who will look it up for you?
The loyalists of New Brunswick
Author: Esther Clark Wright
Publisher: Beaver Bank, N.S., Canada : Justin B. Wentzell, ©2008.
library locator:
https://www.worldcat.org/title/loyalists-of-new-brunswick/oclc/456740815?referer=di&ht=edition#borrow----------
This doesn't help the situation. I thought this was them for a while, but this lady's father was named Samuel:
Massachusetts, Compiled Marriages, 1633-1850
Name: Jeremiah Johnson
Spouse: Challotte Chace
Marriage Date: 20 Oct 1806
City: Swansea
County: Bristol
Source: Family History Library, Salt Lake City, UT, Film # 0022366 item 3 & 0903395 items 7-8
same event, different source:
Name: Jeremiah Johnson
Event Type: Marriage
Marriage Date: 26 Oct 1806
Marriage Place: USA
Spouse Name: Charlotte Chase
Spouse Father Name: Samuel Chase
The New England Historical & Genealogical Register, 1847-2011
Page Number: 26
Volume Number: 088
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and another thought, can you find the son of Nathaniel Johnson (1726-1797) and Sarah Nichols of Fairfield CT on later Connecticut records? If so, he didn't go to New Brunswick. If not, then maybe.
And were they a loyalist family, or were families divided as in the American Civil War? Where did their other sons go? Where did Nathaniel and Sarah die?
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lots of stuff on Reuben Chase here, if you don't have it already. Or maybe you posted it
https://www.wikitree.com/wiki/Chase-1549----------
Does the Wing in your user name come from the New England family of the same name? They are one of the few my wife is not related to by marriage, but there used to be a huge Wing genealogy tree on rootsweb that had some of her connected families. I think he has it on ancestry now.