it's not difficult at all. You'd submit the same documents as you used for the 30 day extension of stay based on tourism, except write down "60 day COVID-19 extension"
I have seen reports of someone being able to get a 60 day extension of stay based on unable to travel due to COVID-19. I believe that’s the only extension of stay possible
You have to leave. The Thai government may be willing to issue an extension of stay based on unable to travel at the request of the embassy. However, I know the French government does not issue the letter.
The only visa I saw in this post was a One Year Multiple Entry Non-O Visa (I'm guessing for being over 50). This visa allows you to enter Thailand multiple times, and on each entry allows you to stay for 90 days.
The visa I'm referring you to acquire is a single entry Non-O Visa based on being a trailing spouse. This visa allows you to enter once, on entry stay for 90 days, and allows a one year extension of stay based on being a trailing spouse to be acquired.
You can get that in-Country Non-O Visa Based on Retirement easily
1. The applicant’s passport and a copy of:
a. The data “picture” page.
b. The most recent visa (if applicable).
c. All entry stamps or extension of stay (if applicable) since arrival.
d. The departure card (“TM. 6”) that should be stapled in the passport.
2. The Extension of Stay Application Form (“TM. 7”).
3. A copy of the submitted Notification of Residence of Foreigners form ("TM. 30”).
4. Proof of finances:
a. A letter from a Thai bank showing that 800,000 THB was transferred into the bank account from overseas, or;
b. Twelve consecutive months of deposits of 65,000 THB a month, transferred from overseas, or;
c. A combination of both income and savings, totaling 800,000 THB or;
d. A letter from their embassy stating a monthly pension of at least 65,000 a month. If the embassy letter can be used, then the proof of the twelve consecutive months of deposits cannot be used to acquire the extension of stay.
5. A hand drawn map to the house where the applicant resides.